5.5.0 release

[#1551] Migrate packages from Bintray to Maven Central

https://sourceforge.net/p/omegat/feature-requests/1551/

5.4.3 release

Correct enhancement count for 5.4.2

Bump to 5.4.1

5.4.0 release

v5.3.0 release date

Note release date

Revert "Add Finnish readme in installer"

This reverts commit f2c4fe2.

Update manuals