Add new string message for forbidden characters controlled by the server

res/values/strings.xml

@@ -213,6 +213,7 @@
     <string name="sync_file_nothing_to_do_msg">File contents already synchronized</string>
     <string name="create_dir_fail_msg">Folder could not be created</string>
     <string name="filename_forbidden_characters">Forbidden characters: / \\ &lt; &gt; : " | ? *</string>
+    <string name="filename_forbidden_charaters_from_server">File name contains at least one invalid character</string>
     <string name="filename_empty">File name cannot be empty</string>
     <string name="wait_a_moment">Wait a moment</string>
     <string name="filedisplay_unexpected_bad_get_content">"Unexpected problem ; please select the file from a different app"</string>