Thunderbird l10n

Hello,

I have problems with 2 strings in Thunderbird. Maybe more, but for now I 
noticed only these two.

Strings in question are:
https://transvision.mozfr.org/?sourcelocale=en-US&locale=hr&repo=gecko_strings&search_type=entities&recherche=calendar/chrome/calendar/calendar-occurrence-prompt.properties:buttons.single.parent.edit.label&entire_string=entire_string

https://transvision.mozfr.org/?sourcelocale=en-US&locale=hr&repo=gecko_strings&search_type=entities&recherche=calendar/chrome/calendar/calendar-occurrence-prompt.properties:buttons.single.occurrence.edit.label&entire_string=entire_string

Those strings were translated 7 months ago as can be seen in Pontoon, 
but there aren't available in latest TB + Lightning.
Is there some kind of bug causing this or any other problems?

Best regards,
Mihovil