feat: add i18n infrastructure and language selector

Co-authored-by: Wikid82 <176516789+Wikid82@users.noreply.github.com>

frontend/src/hooks/useLanguage.ts

@@ -0,0 +1,10 @@
+import { useContext } from 'react'
+import { LanguageContext, LanguageContextType } from '../context/LanguageContextValue'
+
+export function useLanguage(): LanguageContextType {
+  const context = useContext(LanguageContext)
+  if (!context) {
+    throw new Error('useLanguage must be used within a LanguageProvider')
+  }
+  return context
+}