branch features/chat: Some strings not translated

[Kornel Benko]

Hi Tomasso,
some strings, like "Connected" used in BuddiesUi.ui are not translated.

You use in src/frontends/qt4/GuiBuddies.cpp:255 tr("Connected"), but
since tr() is not searched (like e.g. _(), qt_() ...) they don't make it into 
lyx.pot.

        Kornel

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