NSX (Translation string files)
From Blood Wiki
NSX file that store string translations in the form: string_id=translated_string.
This files are only used in translation packs.
Tip: Groups are used as prefixes for string ids to make code shorter.
Example:
[menu_option] res=Resolutions windowed=Windowed bpp=Bits Per Pixel
creates 3 strings:
menu_option_res=Resolutions menu_option_windowed=Windowed menu_option_bpp=Bits Per Pixel
Example of strings file contents:
[menu_btn] yes ="YES" no ="NO" back ="BACK" newgame ="NEW GAME" startgame ="START GAME" options ="OPTIONS" loadgame ="LOAD GAME" savegame ="SAVE GAME"