Fix default title in system tray for plasma5
Merge pull request #53 from Kirek/master

Fix default title in plasma5 system tray
- Small bugfixes;
- Updated translation.
Fix detection of a running KDE desktop
-In newer version of kwin the binary is named kwin_x11 or kwin_wayland
Merge pull request #54 from Kirek/master

Fix detection of a running KDE desktop
- Added new KDE detection logic (thanks to Kirek);
- Refactorings in SearchLineEdit.