Feat/romanian translation (#663)

* feat(i18n): Add Romanian translation

* feat(i18n): Update Romanian translation to lang file changes

* feat(i18n): Add new Romanian translation entries

* fix(i18n): add settings.languageRo to remaining locale bundles

Romanian was missing from the language picker labels when UI was not en/ro;
add endonym-style names per locale (de/fr/nl/nb/ru/es/zh) for consistency.

* fix(i18n): use Romanian autonym for settings.languageRo everywhere

Match existing language picker convention (e.g. languageDe is Deutsch in
every locale bundle). Replaces UI-language translations of Romanian.

src/components/settings/SystemTab.tsx

@@ -59,6 +59,7 @@ export function SystemTab() {
                 { value: 'nb', label: t('settings.languageNb') },
                 { value: 'ru', label: t('settings.languageRu') },
                 { value: 'zh', label: t('settings.languageZh') },
+                { value: 'ro', label: t('settings.languageRo') },
               ]}
             />
           </div>