[UI] added about window
[OTHER] removed unused rowmodel.h
[UI] about window updated with contents, tagged v0.2
[DB] fixed: not all results where added
[DB][UI] added description when more than one key matches
[UI] show results cleanup
[UI][DB] fixed: missing results because of mixed words
[UI] updated version in about window
[DB] fixed: double query in LANG_ITA must not be done, fixed database with unexpected char 51]
[OTHER] cleanup