I have tested the Swedish language pack for RSForm!Pro and have noticed that, in the \administrator\language\sv-SE\sv-SE.com_rsform.sys.ini at line 500, there is a mistyped placeholder. Please replace
LINK TO MENU
with
LINK_TO_MENU
The same placeholder can be found in the \administrator\language\en-GB\en-GB.com_rsform.ini file at line 545, please check it and perform the same operation described above, if necessary.
Note that all other language packs, except the default English pack, are actually donated by our users and may be faulty or incomplete.