Fixed lint

Signed-off-by: Kilian Périsset <kilian.perisset@infomaniak.com>

src/main/res/values/strings.xml

@@ -4,7 +4,6 @@
     <string name="about_version">version %1$s</string>
     <string name="about_version_with_build">version %1$s, build #%2$s</string>
     <string name="appbar_search_in">Search in %s</string>
-    <string name="actionbar_sync">Refresh account</string>
     <string name="actionbar_open_with">Open with</string>
     <string name="actionbar_mkdir">New folder</string>
     <string name="actionbar_settings">Settings</string>