update plugin.
- webbrowser : add german keyboard.
- fpgaupgrade : fix upgrade status and add error message.
- firmwareupgrade : fix upgrade status and add error message.
- [DH] lib/python/Plugins/Extensions/WebBrowser/keymap/Makefile.am
- [DH] lib/python/Plugins/Extensions/WebBrowser/keymap/ch.qmap
- [DH] lib/python/Plugins/Extensions/WebBrowser/keymap/de.qmap
- [DH] lib/python/Plugins/Extensions/WebBrowser/keymap/us.qmap
- [DH] lib/python/Plugins/Extensions/WebBrowser/plugin.py