chore(l10n): update Galician translations

Currently translated at 100.0% (12 of 12 strings)

Translation: Fossify/Paint
Translate-URL: https://hosted.weblate.org/projects/fossify/draw/gl/
Via: Weblate

Author: rcasl

app/src/main/res/values-gl/strings.xml

@@ -11,4 +11,5 @@
     <string name="change_background_color">Cambiar a cor do fondo</string>
     <string name="app_launcher_name">Pintar</string>
     <string name="use_relative_brush_size">Axustar o tamaño do pincel segundo o nivel de zoom</string>
+    <string name="clear_canvas_confirmation">Está certo de querer limpar o lenzo?</string>
 </resources>