Expose hotkeys to localisation.

Allows the Settings > Hotkeys screen to be localised, including hotkey decriptions, groups and contexts.

The hotkey names are exposed to localisation via KeycodeExts. Hotkey modifiers are similarly exposed via ModifersExts.

The Settings > Input screen has a Zoom Modifier dropdown, which shows the localised modifier name.

The --check-yaml utility command is taught to recognise all hotkey translation, so it can validate their usage.

mods/cnc/languages/chrome/en.ftl

@@ -670,6 +670,17 @@ label-gl-profile-dropdown-container = OpenGL Profile:
 label-restart-required-container-video-desc = Display and OpenGL changes require restart
 
 ## settings-hotkeys.yaml
+hotkey-group-game-commands = Game Commands
+hotkey-group-viewport-commands = Viewport Commands
+hotkey-group-observer-replay-commands = Observer / Replay Commands
+hotkey-group-unit-commands = Unit Commands
+hotkey-group-unit-stance-commands = Unit Stance Commands
+hotkey-group-production-commands = Production Commands
+hotkey-group-support-power-commands = Support Power Commands
+hotkey-group-music-commands = Music Commands
+hotkey-group-chat-commands = Chat Commands
+hotkey-group-control-groups = Control Groups
+hotkey-group-editor-commands = Editor Commands
 label-hotkeys-panel-filter-input = Filter by name:
 label-hotkeys-panel-context-dropdown = Context:
 label-hotkey-empty-list-message = No hotkeys match the filter criteria.

mods/cnc/languages/hotkeys/en.ftl

@@ -0,0 +1,8 @@
+## hotkeys.yaml
+hotkey-description-NextProductionTab = Next tab
+hotkey-description-PreviousProductionTab = Previous tab
+hotkey-description-ProductionTypeBuilding = Building Tab
+hotkey-description-ProductionTypeDefense = Defense Tab
+hotkey-description-ProductionTypeInfantry = Infantry Tab
+hotkey-description-ProductionTypeVehicle = Vehicle Tab
+hotkey-description-ProductionTypeAircraft = Aircraft Tab