Notifications are size limited

According to https://msdn.microsoft.com/en-us/library/windows/desktop/ee330740(v=vs.85).aspx, limitations are:

• title: 48 chars
• message: 200 chars

We need to handle that, inform translators, and re-organize translations.

For notifications including a file name or a path, we could change:

• from very/long/path/name/to/display/file.ext
• to /very/lo.../file.ext

That is how DropBox and co are doing.