Set 1.9.0 release date

Set 1.8.1 release date and version

Update translations files; set 1.8.0 release version

Update translations files; set 1.7.0 release

Set 1.6.1 release version

Set 1.6.0 release version

Set 1.5.0 release version and update changelog (#186)

Prepare for 1.4.0 release (#181)

* Prepare for 1.4.0 release

* last-minute patch for detecting changes to color scheme

Set 1.3.2 release version

Set release version 1.3.1