Improve Gerrit (or review based) workflow

[svogt]

Currently when Jabylon pushes for review and the review is rejected (due to a spelling or translation error), there is currently no way to redo that commit on Jabylon side. Even if one abandons the review, Jabylon will push two commits and therefore create two reviews.

We need to think how this could be managed via UI - a first approach might be by implementing a soft reset in Git so one can redo the commit.