It's mandatory to mark translatable strings

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Update test service from tutorial

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add translations to examples

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Translate forms in the test service

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Rename signal AppendPreferences to PreferencesForm

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Move initialization form creation to new signal

Signal Core::InitAppRunner in now run only once and
doesn't cause repeated connection of signal handlers.
That led to repeated entries in preferences form.

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add translations to addRadioAction example

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>