minor update

In the "About" section, you advertise your other apps but the app summary text isn't in this strings.xml file, so there is no way to translate it... must be hardcoded in-app.

If it was localized too, people would understand better what your other apps consist in, and maybe it would increase downloads.

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I hope that it's okay now with other xml files I deleted from the values-fr folder of my repo.
They're not displayed anymore in my repo, but I see them in this pull request with a all lines deletion action.
Just let me know if there something I have to do about it.