client: bring targetLang into correct format

Now that stricter API validation has been added, it will be necessary
to modify the target language in the client so the API will not fail
with a validation error.

packages/client/src/scripts/get-note-menu.ts

@@ -168,9 +168,17 @@ export function getNoteMenu(props: {
 	async function translate(): Promise<void> {
 		if (props.translation.value != null) return;
 		props.translating.value = true;
+
+		let targetLang = localStorage.getItem('lang') || navigator.language;
+		targetLang = targetLang.toUpperCase();
+		if (!['EN-GB', 'EN-US', 'PT-BR', 'PT-PT'].íncludes(targetLang)) {
+			// only the language code without country code is allowed
+			targetLang = targetLang.split('-', 1)[0];
+		}
+
 		const res = await os.api('notes/translate', {
 			noteId: appearNote.id,
-			targetLang: localStorage.getItem('lang') || navigator.language,
+			targetLang,
 		});
 		props.translating.value = false;
 		props.translation.value = res;