Translation

VLC translation is base on gettext

to mark a string for translation:

on C++ side you should use qtr macro which is available in the qt.hpp, this will translate the enclosed string and return a QString
```
addButton->setToolTip(qtr("My tooltip here"));
```
For advanced usage, you can use vlc_gettext/vlc_ngettext functions directly

For indirect translation (string inside a static list for instance), you should use the N_ macro to mark strings for translation

const char* myLabels[] = {
    N_("a label"),
    N_("another label")
};

for( size_t i = 0; i < ARRAY_SIZE(myLabels); i++)
    something->addEntry(qfu(myLabels[i]));

on the QML side you need to use qsTr("my string")
files that contain translated strings needs to be added to the po/POTFILES.in