fix(i18n): Improved grammar

Reported at Transifex

Signed-off-by: rakekniven <2069590+rakekniven@users.noreply.github.com>

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

@@ -997,7 +997,7 @@
     <string name="thumbnail_for_new_file_desc">Thumbnail for new file</string>
     <string name="thumbnail_for_existing_file_description">Thumbnail for existing file</string>
     <string name="invalid_url">Invalid URL</string>
-    <string name="conflict_dialog_error">Conflict resolver dialog cannot able to created</string>
+    <string name="conflict_dialog_error">Conflict resolver dialog cannot be created</string>
     <string name="qr_could_not_be_read">QR code could not be read!</string>
     <string name="note_icon_hint">Note icon</string>
     <string name="add_another_public_share_link">Add another link</string>