Steam Friends Creates Steam Issues

[Zaku-x109]

damn steam...

here it is:

How do I fix my friends Shift+Tab so it will show up? I've tried to turn it off and then back on but it doesn't work. then I tried to exit Steam all together and when I tried to restart the program it gives me "Steam - Error: Failed to load overlay localization file."
I cant get back onto steam what so ever now.
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Pornstars lacey duvalle