if you are comfortable editing a mod, you would extract it, then...
edit Translations/translation_de.xml
change this line...
<text name="CBRH_langCode" text="de"/>
to...
<text name="CBRH_langCode" text="en"/>
zip the mod back up and and it should then FORCE it into english.
let me know if i can be of more help and thank you for trying to mod!