Update getting-started.texy

Just fixed a typo and a comma has been added
Translated remaining part of "Migrating to version 2.1" and fixed som typos
some improvements of "Migrating to version 2.1"
Merge pull request #37 from ujovlado/doc-2.1-remaining-migration-2-1

Translated remaining part of "Migrating to version 2.1"
Merge pull request #34 from TheDocX/patch-1

Update getting-started.texy