[Fuchs2468]

@Fuchs2468 
So there are two issues:
1) Youtube Videos - It seems that the search is based on the "Title" instead of the "Original Title". So if your library titles is based on another language, which is not english, you get an error notification/empty results.
2) I think the "Trailer" button fallback should be Youtube Videos search (As it was I think in the old implementation). I guess TMDB doesn't have a trailer for each language.

I've tested something, it seems that there is a problem with, "script.embuary.helper , script.embuary.info" and "plugin.video.youtube" as regards the read and write direction of language.
For languages from left to right, it functions and on languages from right to left it does not work. 

Your language Hebrew  
Movie for testing with "plugin.video.themoviedb.helper"
https://www.themoviedb.org/movie/537915-after

example: 

Code:

"plugin://plugin.video.youtube/search/?q=אחרי ש..."  correct input ( $INFO[ListItem.Title] )  

Result is wrong

2021-11-04 21:11:54.378 T:6112     INFO <general>: [plugin.video.youtube] Running: YouTube (6.8.18+matrix.1) on Matrix (Kodi-19.3) with Python 3.8.5
                                                       Path: /search/
                                                       Params: {'q': 'ש ירחא...'}


Code:

"plugin://plugin.video.youtube/search/?q=ש ירחא..."  Wrong input (mirrored text) 

Result ok
 
2021-11-04 21:40:13.536 T:16244    INFO <general>: [plugin.video.youtube] Running: YouTube (6.8.18+matrix.1) on Matrix (Kodi-19.3) with Python 3.8.5
                                                       Path: /search/
                                                        Params: {'q': 'אחרי ש...'}