Since nobody has bothered to comment / confirm this bug I bump this by adding:
This bug persists in Beta2
the devs wanted there the word 'none' (in english) and the word 'kein' (in german).
so they picked just the word from 4100 line.
Unfortunatelly , they made it hardcoded so we can't define a new line in text menus and alter ,through the menu_ini ,the game to read that line.
Bottom line is this: if line 4100 is changed to other than 'none' (or 'kein') then you will see whatever word is written there in game sonar menu.
the line 4100 is changed by modders becuase is describing the weather situation in gameplay state so it is one way situation: either you don't change the lines that are describing weather (from 4100 to 4128) and you will be ok with sonar menu screen or you change the weather description to something nicer but you will have to accept also the 4100 text in sonar menu screen.