Translated SE 3.4.3 Chinese Simplified
Merge pull request #330 from larsenlouis/master

Translated SE 3.4.3 Chinese Simplified
Minor fix for "unknown subtitle importer" (now handles tab char as time code separator)
Do not translate "HelpFile"... it's an url
minor refact
Minor fix for "Remove text for HI" + unit test
Update Changelog.txt.

[ci skip]
Added check for another non subtitle file
Updated change log
Fix #327 (wider subtitle formats drop-down)
Refactor command line convert code to new file (main.cs is way too big...)