To close the topic:

- Server flag in app.properties can be set to force a specific language:

Enforce a specific on-screen language in the user interface instead of relying on the user's browser locale selection

The language tag should be in IETF BCP47 format: e.g. en-US, ja, es, fr, pt-BR, etc.

locale.override=<language tag>

- I found out that the locale setting in the browser of the user is a little bit tricky. Be sure that the desired language is on top (priority) of all languages. Also try "different" languages of the same like "en" and "en-US" etc. Don't forget to restart the browser.

Hello Ralph hello Steven,

Thanks for the link Ralph. Unfortunately this is restricted to administrative user. For end users this is no option to change the language.

@Steven, are there any further restrictions you know of that change the language of JRS? My browser (Firefox) has german UI but JRS is in english (which is perfectly fine for me but the behavior is not like you mentioned). Changing the language in about:config - general.useragent.locale to another locale doesn't affect JRS even after restarting ff.

Regarding work item 397250 how can you change the JRS language in 6.0.3?

Best regards