en.lproj/Localizable.strings: cleanup

looking for → checking
reject → decline
search → criteria
verify → check
voice → audio
would you → do you want to
your → the

https://review.jami.net/c/jami-client-android/+/30357
https://review.jami.net/c/jami-client-qt/+/30068

Change-Id: I707ebdf4f8102deceaaff95783f57bca687cd8df