add is_loaded method to check if language files are loaded

Author: A-Ghorab

src/index.ts

@@ -30,6 +30,15 @@ let loaded: LanguageInterface[] = []
  */
 const activeMessages: object = reactive({})
 
+/**
+ * Check if the language files are loaded
+ */
+export function isLoaded(lang?: string) {
+  lang ??= getActiveLanguage();
+
+  return loaded.some((row) => row.lang === lang);
+}
+
 /**
  * Loads the language file.
  */