Issue Summary

While changing the language in the user profile setting from Automatically detect browser setting to different languages, the language in the content (ex: All day/Edit/Delete) of the pop-up window of the Team Calendar becomes incorrect. 

This is reproducible on Data Center: (yes)

Steps to Reproduce 

1. Install Confluence. 
2. Check the Confluence language setting via the user icon > settings > Language
   • Default option is: Automatically detect browser setting. 
3. Check the browser language setting
   • Using English here for testing purposes. 
4. Go to Calendars on Confluence. 
5. Add a Calendar with some events. 
6. Check the language of the content. While the language setting in the Confluence user profile is "Automatically detect browser setting" and the browser language is set to English, the display should show (All day/Edit/Delete) in English.
   
7. Change the Confluence language setting from Automatically detect browser to Deutsch the language display is Deutsch (Dan ganzen Tag/Bearbeiten/Löschen)
8. Change the Confluence user profile from Deutsch to English (UK) the language display is still Deutsch 
9. Change the Confluence user profile from English (UK) to Automatically detect browser setting {}the language display is English   

Expected Results

The language of the content should be displayed depending on the language selected in the Confluence user profile. 

Actual Results

Some languages work as expected and some languages don't as the result below after Confluence is freshly installed:

Test	Result
From Automatically detect browser setting to Deutsch to English (UK)	Display in Deutsch
From Automatically detect browser setting to Deutsch to English (US)	Display in English
From Automatically detect browser setting to Deutsch to France	Display in Deutsch
From Automatically detect browser setting to Deutsch to Italiano	Display in Deutsch

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available.