Then I've focused on handling languages as there were some things which I did not like. Most importantly, Weblate will now try to use existing languages even if used code does not 100% match (eg. cs_CZ and cs-CZ are treated equal). Also with help of locale aliases, some specific variants won't be created and generic one used instead (eg. cs_CZ will use cs, as these are actually same). If there will be need to differentiate them, you still can create language manually and Weblate will use matched one.
Last thing is translation locking - translator can now lock translation for exclusive use and nobody else will be able to work on that. This will help in situations where more people started to work on same translation and basically duplicated the effort.
There are 3 open issues targeted for 1.2 release, but I'm not sure if some of these are good ideas, let's keep the decision for next days.