Internationalization

This MR adds internationalization support for QGeoloGIS.

Internalization files are placed in i18n folder:

• qgeologis.pro => project file
• qgeologis_fr.ts => translation file for french
• qgeologis_fr.qm => compiled french translation

To add a new translation :

• add a new name file on the last file of qgeologis.pro like qgeologis_ru.ts for russian or qgeologis_it for italian.
• use the following command : lupdate qgeologis.pro && pylupdate5 qgeologis.pro to create qgeologis_xx.ts template
• fulfill translation using qtlinguist
• use lrelease qgeologis_xx.ts to compile translation