Display Stats and Issue Publication Date not matching locale

[bokamm]

Describe the bug
Using two locales (English and Japanese), the frontend does not pick up translations for months in the download stats of an article or the publication date of an issue (see screenshots).

To Reproduce
Steps to reproduce the behavior:

1. Activate additional locale/language
2. Check frontend.

Expected behavior
The publication date in Japanese should be 2024年5月1日 not 2024 May 1.
The download graph should display Japanese months as in the locale language file (1月 2月 3月 etc., not Jan Feb Mar etc.).

Screenshots
Publication date in Japanese

Publication date in English

Downloads in Japanese

System Information:

• OJS 3.4.0.5
• Immersion Theme 1.1.2.2
• PHP 8.2.6

Browsers:
Safari, Chrome, Firefox, DuckDuckGo (all newest versions, on macOS 14.4.1

Additional context
I translated the plugin on weblate into Japanese, please integrate in future releases: https://translate.pkp.sfu.ca/projects/plugins/immersion/ja/
(I installed my translation locally for testing)

[asmecher]

Thanks, @bokamm! @Vitaliy-1, adding to your list to consider.