Sprint Burndown Gadget is rendered in the language of the user who first loaded it

Issue Summary

If a Sprint Burndown Gadget is added to a dashboard while the user in their profile a different language than Jira's default, all Sprint Burndown Gadgets will be rendered in that language.

Steps to Reproduce

1. Log into Jira as User A, which must have its language set to Jira's default.
2. Create a new project with sample data, by navigating to Projects > Create Project > Create sample data > Scrum software development.
3. Log off, then log in as User B.
4. Create a new dashboard and share it with all logged-in users.
5. Change language to French (or another language) by navigating to Avatar Icon > Profile.
6. Add a new Sprint Burndown Gadget to the newly created dashboard. The gadget text should be displayed in French (or another language) as expected.
7. Log off, then log in as User A.
8. Navigate to the dashboard created by User B in a previous step. Note how the gadget text is still displaying in French (or another language).
9. Create a new dashboard and share it with all logged-in users.
10. Add a Sprint Burndown Gadget to the newly created dashboard. The gadget text will still be displayed in French (or another language).

Expected Results

• The gadget's text is displayed in the user's language.
• New gadgets added to dashboards are displayed in the user's language.

Actual Results

• The gadget will be displayed in French (or other languages) for all users.
• New gadgets will be displayed in French (or another language) despite that not being the user's language.

Workaround

Edit the dashboard, remove the affected gadget, and re-add the gadget using the desired language as the user default language