diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1ef80ca..bec8064 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -48,9 +48,9 @@ docker-compose up serve
 
 ### How internationalization works
 
-BRouter is translated using [i18next](https://www.i18next.com/) library, via command `gulp i18next`. It extracts translatable elements into `locales/en.json` file (English version).
+BRouter is translated using [i18next](https://www.i18next.com/) library, via command `gulp i18next`. It extracts translatable elements into `locales/en.json` file (English version). (Note that unused translation keys or keys not referenced in `keys.js` might get removed automatically. Make sure to commit any changes first before running this, and only amend the previous commit after checking the diff carefully.)
 
-As soon as this file is modified, it must be uploaded to Transifex (manually) with the command `yarn push-transifex`.
+As soon as this file is modified, it must be uploaded by the maintainers to Transifex (manually) with the command `yarn push-transifex`.
 
 Anyone can then translate BRouter directly on [Transifex](https://www.transifex.com/openstreetmap/brouter-web/) platform.
 
diff --git a/index.html b/index.html
index f5df4de..96d26d7 100644
--- a/index.html
+++ b/index.html
@@ -61,7 +61,8 @@
                             role="button"
                             aria-haspopup="true"
                             aria-expanded="false"
-                            data-i18n="[title]navbar.export-tooltip"
+                            data-i18n="[title]keyboard.generic-shortcut"
+                            data-i18n-options='{ "action": "$t(navbar.export-tooltip)", "key": "X" }'
                             title="Export route"
                         >
                             <span class="fa fa-lg fa-cloud-download" aria-hidden="true"> </span>
@@ -79,6 +80,12 @@
                             aria-haspopup="true"
                             aria-expanded="false"
                             data-i18n="[title]navbar.load.tooltip"
+                            data-i18n-options='{
+                                "tracksAction": "$t(navbar.load.tracks)",
+                                "tracksKey": "O",
+                                "nogosAction": "$t(navbar.load.nogos)",
+                                "nogosKey": "$t(keyboard.shift)+O"
+                            }'
                             title="Load route"
                         >
                             <span class="fa fa-lg fa-cloud-upload" aria-hidden="true"> </span>
@@ -113,7 +120,8 @@
                     </div>
                     <div
                         class="nav-item"
-                        data-i18n="[title]about.tooltip"
+                        data-i18n="[title]keyboard.generic-shortcut"
+                        data-i18n-options='{ "action": "$t(about.tooltip)", "key": "H" }'
                         title="Show more information about BRouter-Web"
                     >
                         <a class="nav-link" href="#" data-toggle="modal" data-target="#about"
@@ -314,7 +322,7 @@
                             updated daily, see dates of
                             <a href="https://brouter.de/brouter/segments4/" target="_blank">data files</a>.
                         </p>
-                        <p data-i18n="[html]about.details">
+                        <p id="aboutLinks" data-i18n="[html]about.details">
                             <i><a href="{{privacyPolicyUrl}}" target="_blank">Privacy Policy</a></i
                             >,
                             <i
@@ -709,7 +717,12 @@
                         <a
                             href="#tab_layers_control"
                             role="tab"
-                            data-i18n="[title]sidebar.layers.tooltip"
+                            data-i18n="[title]sidebar.tab-tooltip"
+                            data-i18n-options='{
+                                "action": "$t(sidebar.layers.tooltip)",
+                                "toggleKey": "T",
+                                "switchKey": "$t(keyboard.shift)+T"
+                            }'
                             title="Select layers"
                         >
                             <!--
@@ -738,7 +751,12 @@
                         <a
                             href="#tab_itinerary"
                             role="tab"
-                            data-i18n="[title]sidebar.itinerary.tooltip"
+                            data-i18n="[title]sidebar.tab-tooltip"
+                            data-i18n-options='{
+                                "action": "$t(sidebar.itinerary.tooltip)",
+                                "toggleKey": "T",
+                                "switchKey": "$t(keyboard.shift)+T"
+                            }'
                             title="Show Itinerary"
                             ><i class="fa fa-map-signs"></i
                         ></a>
@@ -747,7 +765,12 @@
                         <a
                             href="#tab_profile"
                             role="tab"
-                            data-i18n="[title]sidebar.customize-profile.tooltip"
+                            data-i18n="[title]sidebar.tab-tooltip"
+                            data-i18n-options='{
+                                "action": "$t(sidebar.customize-profile.tooltip)",
+                                "toggleKey": "T",
+                                "switchKey": "$t(keyboard.shift)+T"
+                            }'
                             title="Customize profile"
                             ><i class="fa fa-wrench"></i
                         ></a>
@@ -756,7 +779,12 @@
                         <a
                             href="#tab_data"
                             role="tab"
-                            data-i18n="[title]sidebar.data.tooltip"
+                            data-i18n="[title]sidebar.tab-tooltip"
+                            data-i18n-options='{
+                                "action": "$t(sidebar.data.tooltip)",
+                                "toggleKey": "T",
+                                "switchKey": "$t(keyboard.shift)+T"
+                            }'
                             title="Show detailed route data table"
                             ><i class="fa fa-table"></i
                         ></a>
@@ -765,7 +793,12 @@
                         <a
                             href="#tab_statistics"
                             role="tab"
-                            data-i18n="[title]sidebar.analysis.tooltip"
+                            data-i18n="[title]sidebar.tab-tooltip"
+                            data-i18n-options='{
+                                "action": "$t(sidebar.analysis.tooltip)",
+                                "toggleKey": "T",
+                                "switchKey": "$t(keyboard.shift)+T"
+                            }'
                             title="Analyse route"
                             ><i class="fa fa-pie-chart"></i
                         ></a>
@@ -1073,7 +1106,8 @@
                     id="elevation-btn"
                     aria-expanded="false"
                     aria-label="Toggle elevation chart"
-                    data-i18n="[title]footer.elevation-chart"
+                    data-i18n="[title]keyboard.generic-shortcut"
+                    data-i18n-options='{ "action": "$t(footer.elevation-chart)", "key": "E" }'
                     title="Toggle elevation chart"
                 >
                     <span class="fa fa-area-chart"></span>
diff --git a/js/Map.js b/js/Map.js
index 2e26771..deb1145 100644
--- a/js/Map.js
+++ b/js/Map.js
@@ -24,8 +24,8 @@ BR.Map = {
         if (BR.Util.getResponsiveBreakpoint() >= '3md') {
             L.control
                 .zoom({
-                    zoomInTitle: i18next.t('map.zoomInTitle'),
-                    zoomOutTitle: i18next.t('map.zoomOutTitle')
+                    zoomInTitle: i18next.t('keyboard.generic-shortcut', { action: '$t(map.zoomInTitle)', key: '+' }),
+                    zoomOutTitle: i18next.t('keyboard.generic-shortcut', { action: '$t(map.zoomOutTitle)', key: '-' })
                 })
                 .addTo(map);
         }
@@ -105,7 +105,7 @@ BR.Map = {
             var locationControl = L.control
                 .locate({
                     strings: {
-                        title: i18next.t('map.locate-me')
+                        title: i18next.t('keyboard.generic-shortcut', { action: '$t(map.locate-me)', key: 'L' })
                     },
                     icon: 'fa fa-location-arrow',
                     iconLoading: 'fa fa-spinner fa-pulse'
diff --git a/js/control/RoutingOptions.js b/js/control/RoutingOptions.js
index 148655d..2ca6b25 100644
--- a/js/control/RoutingOptions.js
+++ b/js/control/RoutingOptions.js
@@ -48,7 +48,7 @@ BR.RoutingOptions = L.Evented.extend({
 
         // append shortcut text to tooltip
         var button = $('#profile-alternative-form button')[0];
-        button.title = button.title + i18next.t('navbar.profile-tooltip');
+        button.title = button.title + i18next.t('navbar.profile-tooltip', { key: 'G' });
     },
 
     getOptions: function() {
diff --git a/js/index.js b/js/index.js
index 069bc4b..0c7e86f 100644
--- a/js/index.js
+++ b/js/index.js
@@ -46,7 +46,10 @@
 
         search = new BR.Search();
         map.addControl(search);
-        $('#map .leaflet-control-geocoder > button')[0].title = i18next.t('map.geocoder');
+        $('#map .leaflet-control-geocoder > button')[0].title = i18next.t('keyboard.generic-shortcut', {
+            action: '$t(map.geocoder)',
+            key: 'F'
+        });
 
         router = L.bRouter(); //brouterCgi dummyRouter
 
@@ -59,7 +62,10 @@
                         routing.draw(false);
                         control.state('activate-draw');
                     },
-                    title: i18next.t('map.draw-route-stop')
+                    title: i18next.t('keyboard.generic-shortcut', {
+                        action: '$t(map.draw-route-stop)',
+                        key: '$t(keyboard.escape)'
+                    })
                 },
                 {
                     stateName: 'activate-draw',
@@ -68,7 +74,7 @@
                         routing.draw(true);
                         control.state('deactivate-draw');
                     },
-                    title: i18next.t('map.draw-route-start')
+                    title: i18next.t('keyboard.generic-shortcut', { action: '$t(map.draw-route-start)', key: 'D' })
                 }
             ]
         });
@@ -78,7 +84,7 @@
             function() {
                 routing.reverse();
             },
-            i18next.t('map.reverse-route')
+            i18next.t('keyboard.generic-shortcut', { action: '$t(map.reverse-route)', key: 'R' })
         );
 
         var deletePointButton = L.easyButton(
@@ -86,7 +92,7 @@
             function() {
                 routing.deleteLastPoint();
             },
-            i18next.t('map.delete-last-point')
+            i18next.t('keyboard.generic-shortcut', { action: '$t(map.delete-last-point)', key: 'Z' })
         );
 
         deleteRouteButton = L.easyButton(
@@ -94,7 +100,7 @@
             function() {
                 clearRoute();
             },
-            i18next.t('map.clear-route-tooltip')
+            i18next.t('keyboard.generic-shortcut', { action: '$t(map.clear-route)', key: '$t(keyboard.backspace)' })
         );
 
         L.DomEvent.addListener(
@@ -175,8 +181,11 @@
             profile.update(evt.options);
         });
 
-        BR.NogoAreas.MSG_BUTTON = i18next.t('map.nogo.draw');
-        BR.NogoAreas.MSG_BUTTON_CANCEL = i18next.t('map.nogo.cancel');
+        BR.NogoAreas.MSG_BUTTON = i18next.t('keyboard.generic-shortcut', { action: '$t(map.nogo.draw)', key: 'N' });
+        BR.NogoAreas.MSG_BUTTON_CANCEL = i18next.t('keyboard.generic-shortcut', {
+            action: '$t(map.nogo.cancel)',
+            key: '$t(keyboard.escape)'
+        });
         BR.NogoAreas.MSG_CREATE = i18next.t('map.nogo.click-drag');
         BR.NogoAreas.MSG_DISABLED = i18next.t('map.nogo.edit');
         BR.NogoAreas.MSG_ENABLED = i18next.t('map.nogo.help');
@@ -305,7 +314,7 @@
 
         BR.tracksLoader(map, layersControl, routing);
 
-        BR.routeLoader(map, layersControl, routing,pois);
+        BR.routeLoader(map, layersControl, routing, pois);
 
         pois.addTo(map);
         routingPathQuality.addTo(map);
@@ -313,7 +322,7 @@
         map.addControl(
             new BR.OpacitySliderControl({
                 id: 'route',
-                title: i18next.t('map.opacity-slider'),
+                title: i18next.t('map.opacity-slider-shortcut', { action: '$t(map.opacity-slider)', key: 'M' }),
                 muteKeyCode: 77, // m
                 callback: L.bind(routing.setOpacity, routing)
             })
@@ -456,8 +465,9 @@
                 }
             },
             function(err, t) {
-                jqueryI18next.init(i18next, $);
-                $('html').localize({
+                jqueryI18next.init(i18next, $, { useOptionsAttr: true });
+                $('html').localize();
+                $('#aboutLinks').localize({
                     privacyPolicyUrl: BR.conf.privacyPolicyUrl || 'https://brouter.de/privacypolicy.html'
                 });
 
diff --git a/js/plugin/POIMarkers.js b/js/plugin/POIMarkers.js
index dce84ae..5d82f06 100644
--- a/js/plugin/POIMarkers.js
+++ b/js/plugin/POIMarkers.js
@@ -25,7 +25,7 @@ BR.PoiMarkers = L.Control.extend({
                     onClick: function() {
                         self.draw(true);
                     },
-                    title: i18next.t('map.draw-poi-start')
+                    title: i18next.t('keyboard.generic-shortcut', { action: '$t(map.draw-poi-start)', key: 'P' })
                 },
                 {
                     stateName: 'deactivate-poi',
@@ -33,7 +33,10 @@ BR.PoiMarkers = L.Control.extend({
                     onClick: function() {
                         self.draw(false);
                     },
-                    title: i18next.t('map.draw-poi-stop')
+                    title: i18next.t('keyboard.generic-shortcut', {
+                        action: '$t(map.draw-poi-stop)',
+                        key: '$t(keyboard.escape)'
+                    })
                 }
             ]
         }).addTo(map);
diff --git a/js/plugin/RouteLoaderConverter.js b/js/plugin/RouteLoaderConverter.js
index 201bd9f..ce3c278 100644
--- a/js/plugin/RouteLoaderConverter.js
+++ b/js/plugin/RouteLoaderConverter.js
@@ -250,7 +250,7 @@ BR.routeLoader = function(map, layersControl, routing, pois) {
 
             if (!this._options.format) this._options.format = trackFile.name.split('.').pop();
 
-            const reader = new FileReader();
+            var reader = new FileReader();
 
             reader.onload = L.bind(this.processFile, this);
             reader.readAsText(trackFile);
diff --git a/js/plugin/RoutingPathQuality.js b/js/plugin/RoutingPathQuality.js
index 76dd6bc..2d5a97b 100644
--- a/js/plugin/RoutingPathQuality.js
+++ b/js/plugin/RoutingPathQuality.js
@@ -21,7 +21,7 @@ BR.RoutingPathQuality = L.Control.extend({
 
         this.providers = {
             incline: {
-                title: i18next.t('map.route-quality-incline'),
+                title: i18next.t('map.route-quality-shortcut', { action: '$t(map.route-quality-incline)', key: 'C' }),
                 icon: 'fa-line-chart',
                 provider: new HotLineQualityProvider({
                     hotlineOptions: {
@@ -48,7 +48,7 @@ BR.RoutingPathQuality = L.Control.extend({
                 })
             },
             altitude: {
-                title: i18next.t('map.route-quality-altitude'),
+                title: i18next.t('map.route-quality-shortcut', { action: '$t(map.route-quality-altitude)', key: 'C' }),
                 icon: 'fa-area-chart',
                 provider: new HotLineQualityProvider({
                     hotlineOptions: {
@@ -61,7 +61,7 @@ BR.RoutingPathQuality = L.Control.extend({
                 })
             },
             cost: {
-                title: i18next.t('map.route-quality-cost'),
+                title: i18next.t('map.route-quality-shortcut', { action: '$t(map.route-quality-cost)', key: 'C' }),
                 icon: 'fa-usd',
                 provider: new HotLineQualityProvider({
                     hotlineOptions: {
diff --git a/js/plugin/Sidebar.js b/js/plugin/Sidebar.js
index 0199906..36269f2 100644
--- a/js/plugin/Sidebar.js
+++ b/js/plugin/Sidebar.js
@@ -123,24 +123,24 @@ BR.Sidebar = L.Control.Sidebar.extend({
     _keydownListener: function(e) {
         if (BR.Util.keyboardShortcutsAllowed(e) && e.keyCode === this.options.shortcut.toggleTabs) {
             if ($('#sidebarTabs > ul > li[class=active]').length) {
-                // sidebar is currently open
-                if (e.shiftKey) {
-                    // try to find next tab
-                    var nextTab = $('#sidebarTabs > ul > li[class=active] ~ li:not([hidden]) > a');
-                    if (!nextTab.length) {
-                        // wrap around to first tab
-                        nextTab = $('#sidebarTabs > ul > li:not([hidden]) > a');
-                    }
-                    // switch to next or first tab
-                    this.open(nextTab.attr('href').slice(1));
-                } else {
-                    // close current tab
+                // sidebar is currently open, close current tab
+                if (!e.shiftKey) {
                     this.close();
                 }
             } else {
                 // sidebar is currently closed, open recent or default tab
                 this.open(this.recentTab);
             }
+            if (e.shiftKey) {
+                // try to find next tab
+                var nextTab = $('#sidebarTabs > ul > li[class=active] ~ li:not([hidden]) > a');
+                if (!nextTab.length) {
+                    // wrap around to first tab
+                    nextTab = $('#sidebarTabs > ul > li:not([hidden]) > a');
+                }
+                // switch to next or first tab
+                this.open(nextTab.attr('href').slice(1));
+            }
         }
     }
 });
diff --git a/js/plugin/stravaSegments.js b/js/plugin/stravaSegments.js
index a4de7ec..626a9db 100644
--- a/js/plugin/stravaSegments.js
+++ b/js/plugin/stravaSegments.js
@@ -1,8 +1,8 @@
 BR.stravaSegments = function(map, layersControl) {
     var stravaControl = L.control
         .stravaSegments({
-            runningTitle: i18next.t('map.strava-running'),
-            bikingTitle: i18next.t('map.strava-biking'),
+            runningTitle: i18next.t('map.strava-shortcut', { action: '$t(map.strava-running)', key: 'S' }),
+            bikingTitle: i18next.t('map.strava-shortcut', { action: '$t(map.strava-biking)', key: 'S' }),
             loadingTitle: i18next.t('map.loading'),
             stravaToken: BR.keys.strava
         })
diff --git a/locales/en.json b/locales/en.json
index 56573bf..04cd2eb 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -12,7 +12,7 @@
     "details": "<i><a href=\"{{privacyPolicyUrl}}\" target=\"_blank\">Privacy Policy</a></i>, \n<i><a href=\"https://github.com/nrenner/brouter-web#credits-and-licenses\" target=\"_blank\">Credits</a></i>,\n<i><a href=\"https://github.com/nrenner/brouter-web/blob/master/CHANGELOG.md\" target=\"_blank\">Changelog</a></i> and\n<i><a href=\"https://github.com/nrenner/brouter-web#readme\" target=\"_blank\">more info</a></i> on the client.",
     "support": "General discussions/questions, support",
     "title": "About",
-    "tooltip": "Show more information about Brouter-Web (H key)"
+    "tooltip": "Show more information about Brouter-Web"
   },
   "credits": {
     "brouter": "BRouter",
@@ -42,7 +42,7 @@
     "ascend": "Ascend",
     "cost": "Cost",
     "distance": "Distance",
-    "elevation-chart": "Toggle elevation chart (E key)",
+    "elevation-chart": "Toggle elevation chart",
     "energy-per-100km": "Energy per 100 km",
     "hours": "hours",
     "hours-abbrev": "h",
@@ -58,6 +58,12 @@
     "total-energy": "Total Energy",
     "travel-time": "Travel time"
   },
+  "keyboard": {
+    "backspace": "Backspace",
+    "escape": "Escape",
+    "generic-shortcut": "{{action}} ({{key}} key)",
+    "shift": "Shift"
+  },
   "layers": {
     "add-base": "Add base layer",
     "add-overlay": "Add overlay",
@@ -82,19 +88,18 @@
     "attribution-osm-long": "OpenStreetMap contributors",
     "attribution-osm-short": "OpenStreetMap",
     "clear-route": "Clear route data",
-    "clear-route-tooltip": "Clear route data (Backspace key)",
     "copyright": "Copyright",
     "cycling": "Cycling",
-    "delete-last-point": "Delete last point (Z key)",
+    "delete-last-point": "Delete last point",
     "delete-nogo-areas": "Delete all no-go areas",
     "delete-pois": "Delete all points of interest",
     "delete-route": "Delete route",
-    "draw-poi-start": "Draw points of interest (P key)",
-    "draw-poi-stop": "Stop drawing points of interest (ESC key)",
-    "draw-route-start": "Draw route (D key)",
-    "draw-route-stop": "Stop drawing route (ESC key)",
+    "draw-poi-start": "Draw points of interest",
+    "draw-poi-stop": "Stop drawing points of interest",
+    "draw-route-start": "Draw route",
+    "draw-route-stop": "Stop drawing route",
     "enter-poi-name": "Enter Point of Interest name",
-    "geocoder": "Search (F key)",
+    "geocoder": "Search",
     "geocoder-placeholder": "Search…",
     "hikebike-hillshading": "Hillshading",
     "hiking": "Hiking",
@@ -115,25 +120,28 @@
       "topo": "OpenTopoMap"
     },
     "loading": "Loading…",
-    "locate-me": "Show me where I am (L key)",
+    "locate-me": "Show me where I am",
     "nogo": {
-      "cancel": "Cancel drawing no-go area (ESC key)",
+      "cancel": "Cancel drawing no-go area",
       "click-drag": "Click and drag to draw circle",
-      "draw": "Draw circular no-go area (N key)",
+      "draw": "Draw circular no-go area",
       "edit": "Click to edit",
       "help": "&square; = move / resize, <span class=\"fa fa-trash-o\"></span> = delete,<br>click circle to quit editing"
     },
-    "opacity-slider": "Set transparency of route track and markers\n(Hold M key to mute temporarily)",
+    "opacity-slider": "Set transparency of route track and markers",
+    "opacity-slider-shortcut": "{{action}}\n(Hold {{key}} key to mute temporarily)",
     "preview": "Preview",
     "privacy": "Privacy",
-    "reverse-route": "Reverse route (R key)",
-    "route-quality-altitude": "Altitude coding (C key to toggle)",
-    "route-quality-cost": "Cost coding (C key to toggle)",
-    "route-quality-incline": "Incline coding (C key to toggle)",
-    "strava-biking": "Show Strava biking segments\n(S key to toggle layer, click to reload for current area)",
-    "strava-running": "Show Strava running segments\n(S key to toggle layer, click to reload for current area)",
-    "zoomInTitle": "Zoom in (+ key)",
-    "zoomOutTitle": "Zoom out (- key)"
+    "reverse-route": "Reverse route",
+    "route-quality-altitude": "Altitude coding",
+    "route-quality-cost": "Cost coding",
+    "route-quality-incline": "Incline coding",
+    "route-quality-shortcut": "{{action}} ({{key}} key to toggle)",
+    "strava-biking": "Show Strava biking segments",
+    "strava-running": "Show Strava running segments",
+    "strava-shortcut": "{{action}}\n({{key}} key to toggle layer, click to reload for current area)",
+    "zoomInTitle": "Zoom in",
+    "zoomOutTitle": "Zoom out"
   },
   "modal": {
     "close": "Close"
@@ -147,12 +155,12 @@
       "third": "3rd alternative"
     },
     "export": "Export",
-    "export-tooltip": "Export route (X key)",
+    "export-tooltip": "Export route",
     "load": {
-      "nogos": "No-go areas",
+      "nogos": "Load no-go areas",
       "title": "Load",
-      "tooltip": "Load tracks (O key)\nLoad No-go areas (Shift+O)",
-      "tracks": "Tracks"
+      "tooltip": "{{tracksAction}} ({{tracksKey}} key)\n{{nogosAction}} ({{nogosKey}})",
+      "tracks": "Load tracks"
     },
     "profile": {
       "car-eco": "Car (economic)",
@@ -176,7 +184,7 @@
       "vm-forum-liegerad-schnell": "Recumbent bike (fast)",
       "vm-forum-velomobil-schnell": "Velomobile (fast)"
     },
-    "profile-tooltip": "\n(G key to switch)"
+    "profile-tooltip": "\n({{key}} key to switch)"
   },
   "sidebar": {
     "analysis": {
@@ -192,20 +200,20 @@
         "unknown": "Unknown"
       },
       "title": "Analysis",
-      "tooltip": "Analyse route\n(T key to toggle, Shift+T to switch to next tab)"
+      "tooltip": "Analyse route"
     },
     "customize-profile": {
       "title": "Customize profile",
-      "tooltip": "Customize profile\n(T key to toggle, Shift+T to switch to next tab)"
+      "tooltip": "Customize profile"
     },
     "data": {
       "sync-map": "Synchronize map",
       "title": "Data",
-      "tooltip": "Show detailed route data table\n(T key to toggle, Shift+T to switch to next tab)"
+      "tooltip": "Show detailed route data table"
     },
     "itinerary": {
       "title": "Itinerary",
-      "tooltip": "Show itinerary\n(T key to toggle, Shift+T to switch to next tab)"
+      "tooltip": "Show itinerary"
     },
     "layers": {
       "category": {
@@ -232,7 +240,7 @@
         "type": "Type"
       },
       "title": "Layers",
-      "tooltip": "Select layers\n(T key to toggle, Shift+T to switch to next tab)"
+      "tooltip": "Select layers"
     },
     "profile": {
       "apply": "Apply",
@@ -242,14 +250,14 @@
       "options": "Options",
       "placeholder": "Write your custom profile here.",
       "profile": "Profile"
-    }
+    },
+    "tab-tooltip": "{{action}}\n({{toggleKey}} key to toggle, {{switchKey}} to switch to next tab)"
   },
   "title": "BRouter web client",
   "trackasroute": {
     "explainpoi": "(show waypoints as POI's)",
     "explaintracklayer": "(show Track as separate Layer)",
     "file": "Trackfile",
-    "fromext": "from file extension",
     "fuzziness": "fuzzines",
     "pleasewait": "Please wait!",
     "showpois": "POI's",
diff --git a/locales/keys.js b/locales/keys.js
index 23f5255..498a56c 100644
--- a/locales/keys.js
+++ b/locales/keys.js
@@ -1,4 +1,33 @@
 // this file contains translatable keys that are dynamic / not visible by i18n extractor tool
+
+i18next.t('about.tooltip');
+
+i18next.t('footer.elevation-chart');
+
+i18next.t('keyboard.backspace');
+i18next.t('keyboard.escape');
+i18next.t('keyboard.shift');
+
+i18next.t('map.delete-last-point');
+i18next.t('map.draw-poi-start');
+i18next.t('map.draw-poi-stop');
+i18next.t('map.draw-route-start');
+i18next.t('map.draw-route-stop');
+i18next.t('map.geocoder');
+i18next.t('map.locate-me');
+i18next.t('map.nogo.cancel');
+i18next.t('map.nogo.draw');
+i18next.t('map.opacity-slider');
+i18next.t('map.reverse-route');
+i18next.t('map.route-quality-altitude');
+i18next.t('map.route-quality-cost');
+i18next.t('map.route-quality-incline');
+i18next.t('map.strava-biking');
+i18next.t('map.strava-running');
+i18next.t('map.zoomInTitle');
+i18next.t('map.zoomOutTitle');
+
+i18next.t('navbar.export-tooltip');
 i18next.t('navbar.profile.car-eco');
 i18next.t('navbar.profile.car-fast');
 i18next.t('navbar.profile.car-test');
@@ -20,11 +49,16 @@ i18next.t('navbar.profile.trekking-steep');
 i18next.t('navbar.profile.vm-forum-liegerad-schnell');
 i18next.t('navbar.profile.vm-forum-velomobil-schnell');
 
+i18next.t('sidebar.analysis.tooltip');
+i18next.t('sidebar.customize-profile.tooltip');
+i18next.t('sidebar.data.tooltip');
+i18next.t('sidebar.itinerary.tooltip');
 i18next.t('sidebar.layers.category.base-layers', 'Base layers');
-i18next.t('sidebar.layers.category.worldwide-international', 'Worldwide international');
-i18next.t('sidebar.layers.category.worldwide-monolingual', 'Worldwide monolingual');
+i18next.t('sidebar.layers.category.country', 'Country');
 i18next.t('sidebar.layers.category.europe', 'Europe');
 i18next.t('sidebar.layers.category.europe-monolingual', 'Europe monolingual');
-i18next.t('sidebar.layers.category.country', 'Country');
 i18next.t('sidebar.layers.category.overlays', 'Overlays');
 i18next.t('sidebar.layers.category.worldwide', 'Worldwide');
+i18next.t('sidebar.layers.category.worldwide-international', 'Worldwide international');
+i18next.t('sidebar.layers.category.worldwide-monolingual', 'Worldwide monolingual');
+i18next.t('sidebar.layers.tooltip');