Add TinyMediaManager compatibility for german parental rating
This commit adds the format which gets written by
the tool TinyMediaManager which can be used to
manage large media databases comfortably.
TMM writes wither multiple Codes and/or space
divided german FSK codes, but can't be configured
to only use the number or the slash delimited variant.
After this change the parental control for Libraries
managed with TMM and presented/loaded into Jellyfin
should work again.
Christoph Landsdorf