Corrections and consistency improvements in Dutch language file.
Merge pull request #237 from xylographe/nl2

Corrections and consistency improvements in Dutch language file.
A few minor fixes
Update .gitignore.
more minor performance fixes
Merge branch 'master' of https://github.com/SubtitleEdit/subtitleedit
Updated Chinese language file - thx Leon :)
minor perf fix
installer: Include Slovenian translation.

Also, be consistent with the language names.
SE 3.4.2
About dialog "build 0" changed to just hash
Fixed bug in "Add missing dashes" + "remove unneeded spaces" - thx Andrew  :)
"Fix missing spaces" bug fixed (e.g. being noisy again.Shush them. >being noisy again. Shush them.)
Format everything with codemaid.
Add a custom rule set.