Redmine

I've noticed that redmine has "english (british)" (en-GB) as only english, but some plugins are in "english" (en), how I add "english" (en) to the available languages?

It may depend on the version you're using but in the current versions of Redmine there are both en and en-GB available.
https://redmine.org/projects/redmine/repository/show/trunk/config/locales
If it's missing just grab a fresh copy of your version of Redmine and copy it into the config/locales folder. Don't forget to restart Redmine after doit so.

no, in my config/locales there are both files
it seems that my redmine take en_GB as language, and if a user users another english this is not loaded

I did a quick check in my dev environment at current trunk. It seems like every thing works as expected with two users, one of them using English and the other one using English(British) at the same time. I also did a diff over both locale files. The en-GB.yml file seems very outdated to me since it's missing lots of strings. You can easily find out which file is loaded by comparing the labels when adding a relationship to an issue. They start upper-case in the English version and lower-case in the English(British) version.

are you speaking about setting language in your chrome settings? in my redmine configuration panel there is only GB english, even if in locale folder there are both en-GB.yml and en.yml

any suggestions?
thanks

That's weird. There should be both of them available. What version of Redmine do you have installed?
Perhaps that's an issue with file permissions. Is the en.yml file readable by the user running Redmine?

I'm using 3.4.11
and yes, all yml files have same permissions

it seems that my redmine take en_GB as language, and if a user users another english this is not loaded

I've tested it on two instances of mine with 3.4 and 4.1 installed and I cannot reproduce this behavior in any way. Both have English and English(GB) in their list of languages no matter what I do.

how are languages loaded? redmine reads locale folder? what if I remove en-GB.yml?

I upgraded from 3.4.11 to 3.4.13 and fixed: "english" appeared and all worked fine for a couple of days
this morning, again, all english translations are missing

up

this morning it was working, and now again translation is missing
what the hell is happening?

please remove spam from this thread

I've cleared again cache with:

bundle exec rake tmp:cache:clear RAILS_ENV=production

it still appears and disappers, now I've redmine in italian and some translations are missing
also email sent by redmine, sometimes are missing of some translations
I've also tried to give 755 to tmp folder

update

english is still appearing and disappearing, apparently without any logic

I suppose yes, in language menu there are all available languages, I dont know if someone is missing but I dont think, they are many

This sounds more like a Rails problem to me. A small portion of google foo got me to these URLs where they have kind of the same problem.
https://www.ruby-forum.com/t/randomly-keys-translation-missing-in-production/201828/2
https://stackoverflow.com/questions/4884970/mixed-locales-in-rails-i18n

Perhaps you can extract some useful bit of it.

to be honest, the issue started after upgrading redmine AND system
I've ubuntu 18.04.5 with this packages:

ii  rails                                  2:4.2.10-0ubuntu4                               all          MVC ruby based framework geared for web application development (metapackage)
ii  rake                                   12.3.1-1ubuntu0.1                               all          ruby make-like utility
ii  ruby                                   1:2.5.1                                         amd64        Interpreter of object-oriented scripting language Ruby (default version)
ii  ruby-coffee-rails                      4.1.0-2                                         all          Coffee Script adapter for the Rails asset pipeline
ii  ruby-jquery-rails                      4.3.1-1                                         all          jQuery for Rails 3+
ii  ruby-rails                             2:4.2.10-0ubuntu4                               all          MVC ruby based framework geared for web application development
ii  ruby-rails-deprecated-sanitizer        1.0.3-2                                         all          HTML sanitizer API extracted from Action View
ii  ruby-rails-dom-testing                 1.0.6-2                                         all          SOM and Selector assertions for Rails applications
ii  ruby-rails-html-sanitizer              1.0.4-1                                         all          HTML sanitization for Rails applications
ii  ruby-sass-rails                        5.0.6-1                                         all          Sass adapter for the Rails asset pipeline
ii  ruby-sprockets-rails                   2.3.2-1                                         all          Sprockets Rails integration (part of Rails)

I've created a daily script to clear cache, but issue is still happening
english (and only it) disappears from the languages menu