Activity Stream Macro does not respect user's language preference

After changing the User Language preference, Activity Stream in Macro Browser does not change accordingly

Steps To Reproduce

1. Set user's language preference to German
2. Edits a page and opens the macro browser
3. Now the user changes the language in his individual settings to "français (France)".
4. Edits a page again and opens the macro browser (screenshot_2.png):

Actual Behavior

While in German:

• Activity Stream Macro in Macro Browser still in English (label 1)
• Other Macro still in German (label 2)
• All label in German (label 3)

After changed to French:

• Activity Stream Macro in Macro Browser still in English (label 1)
• Other Macro still in German (label 2)
• Some label in German (label 3)
• Some label in French (label 4)

After clearing browser's cookies and caches:

• Activity Stream Macro in Macro Browser still in English (label 1).
• Macros in French (label 2)
• All label in French (label 4)

Workaround

Delete browser's cookies and caches and restart Confluence. Delete browser's cookies and caches is not enough to fix the issue