chore(l10n): update Basque translations

Currently translated at 84.3% (774 of 918 strings)

Translation: Fossify/Commons
Translate-URL: https://hosted.weblate.org/projects/fossify/commons/eu/
Via: Weblate

Author: Alexander Gabilondo

commons/src/main/res/values-eu/strings.xml

@@ -957,4 +957,8 @@
     <string name="theme_and_colors">Itxura eta koloreak</string>
     <string name="all_fossify_apps">Fossifyren aplikazio guztiak</string>
     <string name="known_issues">Errore ezagunak</string>
+    <plurals name="files_saved">
+        <item quantity="one">Fitxategia behar bezala gorde da</item>
+        <item quantity="other">Fitxategiak behar bezala gorde dira</item>
+    </plurals>
 </resources>