To reproduce:

1. Setting the display language of Windows 10 to Swedish (installed the Swedish language pack)
2. AND using attached Picard.ini
3. AND running Picard installed from installer (I used both official 2.1.2 and custom built installer for current dev version)

Starting picard.exe from either start menu or command prompt will start the exe and then suddenly crash it before any window is displayed. Output when starting from command prompt:

c:\Program Files\MusicBrainz Picard>D: 10:05:14,677 tagger._init_:196: Starting Picard from 'c:
Program Files
MusicBrainz Picard\\picard
tagger.pyc'
D: 10:05:14,677 tagger._init_:198: Platform: Windows-10-10.0.17763-SP0 CPython 3.7.0
D: 10:05:14,677 tagger._init_:199: Versions: Picard 2.1.3.dev1, Python 3.7.0, PyQt 5.11.3, Qt 5.11.2, Mutagen 1.41.1, Discid discid 1.1.1, libdiscid 0.6.2, astrcmp Python, SSL OpenSSL 1.0.2k  26 Jan 2017
D: 10:05:14,677 tagger._init_:200: Configuration file path: 'C:/Users/Developer/AppData/Roaming/MusicBrainz/Picard.ini'
D: 10:05:14,677 tagger._init_:202: User directory: 'C:\\Users\\Developer\\AppData\\Local\\MusicBrainz
Picard'

Picard launches perfectly fine even with attached Picard.ini if I set Windows display language to English or German or if I run Picard from source. I also cannot reproduce the behavior with a fresh Picard.ini.

See:

https://community.metabrainz.org/t/picard-doesnt-launch-on-windows-10/413644/12