feat: add specific 'Search modes...' translation key for ModeSelector

- Add new modeSelector.searchPlaceholder key to all language files
- Update ModeSelector to use chat:modeSelector.searchPlaceholder instead of generic search placeholder
- Provides more contextual and user-friendly search placeholder text
- Maintains consistency across all 18 supported languages

Co-authored-by: Roo Code Translate Mode

Author: hannesrudolph

webview-ui/src/components/chat/ModeSelector.tsx

@@ -155,7 +155,7 @@ export const ModeSelector = ({
 							ref={searchInputRef}
 							value={searchValue}
 							onChange={(e) => setSearchValue(e.target.value)}
-							placeholder={t("common:ui.search_placeholder")}
+							placeholder={t("chat:modeSelector.searchPlaceholder")}
 							className="w-full h-8 px-2 py-1 text-xs bg-vscode-input-background text-vscode-input-foreground border border-vscode-input-border rounded focus:outline-0"
 							data-testid="mode-search-input"
 						/>

webview-ui/src/i18n/locales/ca/chat.json

@@ -118,7 +118,8 @@
 		"title": "Modes",
 		"marketplace": "Mode Marketplace",
 		"settings": "Mode Settings",
-		"description": "Specialized personas that tailor Roo's behavior."
+		"description": "Specialized personas that tailor Roo's behavior.",
+		"searchPlaceholder": "Search modes..."
 	},
 	"enhancePromptDescription": "The 'Enhance Prompt' button helps improve your prompt by providing additional context, clarification, or rephrasing. Try typing a prompt in here and clicking the button again to see how it works.",
 	"addImages": "Add images to message",