Localization: don't go via C-string in qthelper.cpp

The purpose of the gettextFromC class is twofold:
1) It provides a static storage of C strings if the C part needs
a translation and doesn't want to deal with memory-management.
2) It severs as a catch-all class for translations that do not come
from a proper class (i.e. from helper functions).

The second case was used a few times in qthelper.cpp. By using the
trGettext() function, a cached C-string was obtained. But in every
single instance, this C-string was then back-converted into a QString.
Therefore, use the gettextFromC::tr() function directly, which
returns a QString. Not only is the resulting code simpler - this also
avoids superfluous caching of translation strings.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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