Files like datepicker-en-GB.js are not found because file is searched with locale that is lowercase.
These files should be in lower case.
Updated by Marius BALTEANU over 4 years ago
I cannot reproduce on the current trunk or latest Redmine version (4.0.3), please see:
Maybe it is something generated by your plugins, please see an older issue on the same topic (#13412).
Updated by Jérôme BATAILLE about 4 years ago
This issue happens in one of my plugins : https://github.com/Smile-SA/redmine_datetime_custom_field/issues/1
To be clear, all the localized versions of this file are lowercase, except for en-GB.
This is the reason it fails just for this language.
If think that anyway, for uniformity sake this file should be lowercase like the others.