You're running a full conversion mod. Make sure that the main_init.cfg file you are launching from your batch is the one for your mod.
Make sure that there is these two lines are in your main_init.cfg file as well. Rename or change them if necessary:
DefaultGameLanguage = "english.lang"
GameLanguageFolder = "myconversion/config/lang/"
Note: Rename the "myconversion" part of the second thing to your Full Conversion folder. It's a good idea to also add your Full Conversion prefix to Line 27 (below), just like the GameLanguageFolder entry.
The respective locations are on Line 21 and Line 28 of mine, and should be similar in your case.
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