Issue retrieving custom language STRING from activities logs

Hi Team,

I have added a number of multilingual string as Application's title, everything works fine until I check out the Activity Log. Please refer to my screenshot and details listed below. I guess activity log is unable to retrieve language file for the content page.

- Filter title for Dashboard and Activity Log : OK
- Stream items in Dashboard : OK
- Badges info and title in Achievements page : OK
- Items in Activity Log : Unable to get custom string

Please advise where should I place my custom string to get it work. p.s. I tried putting in frond-end override.ini language file but still don't work; I guess the program is not picking up the string for those specific items.

Thanks.

Best regards,
Alfred / Dreamonde