Separate script for locomotion, add import from po file

* Create script to import from Locamotion, with possibility to choose between local or remote repo.
* Add script to import single .po file (fix issue #102)
* Move functions to get CLI or GET parameter to Utils class with tests.
* Move readme to [wiki](https://github.com/pascalchevrel/langchecker/wiki)
yeah, "local" everywhere (the fact that "local" is translated as "locale" in Italian doesn't help my brain, I do this mistake a lot)