Add Arabic as a supported language

[zenmonkeykstop]

Status

Ready for review

Description of Changes

Fixes #6605

Adds Arabic to securedrop/i18n.json, making it available as a supported language

Testing

• on this branch, run ./securedrop-admin sdconfig in an admin workstation and verify the ar locale is valid
• complete an install with ar as a supported language and verify that it's available in the locale dropdown and can be selected.

[cfm]

I agree that this is an oversight; I should have added a check for this in #6557's test plan. I'll test this as part of QA today.

[cfm]

Looks good:

• on this branch, run ./securedrop-admin sdconfig in an admin workstation and verify the ar locale is valid
• complete an install with ar as a supported language and verify that it's available in the locale dropdown and can be selected.

Yes, though for some reason it took two securedrop-admin --force installs to apply the change in—

TASK [app : Update SUPPORTED_LOCALES in config.py] *****************************
changed: [app]

—and then a manual ssh app sudo systemctl restart apache2 to pick it up.

• All languages previously defined in I18NTool.supported_languages are now defined in i18n.json:

user@sd-dev:~/securedrop$ git checkout 2.4.2
user@sd-dev:~/securedrop$ securedrop/bin/dev-shell ./i18n_tool.py list-locales
ar ca cs de_DE el en_US es_ES fr_FR hi is it_IT nb_NO nl pt_BR pt_PT ro ru sk sv tr zh_Hans zh_Hant
user@sd-dev:~/securedrop$ git checkout develop securedrop/i18n.json
Updated 1 path from 4f697cd4e
user@sd-dev:~/securedrop$ for lang in $(securedrop/bin/dev-shell ./i18n_tool.py list-locales); do jq ".supported_locales | has(\"$(echo $lang | sed 's/\r$//')\") // \"$lang\"" securedrop/i18n.json | grep -v "true"; done
"ar"
"en_US"
user@sd-dev:~/securedrop$ git checkout 6605-add-ar securedrop/i18n.json
Updated 1 path from 733d8d79a
user@sd-dev:~/securedrop$ for lang in $(securedrop/bin/dev-shell ./i18n_tool.py list-locales); do jq ".supported_locales | has(\"$(echo $lang | sed 's/\r$//')\") // \"$lang\"" securedrop/i18n.json | grep -v "true"; done
"en_US"

(en_US is expected to be omitted, because it's the unenumerated default locale.)