iOS translations consist of a 500 words description essay plus a few lines of frontend strings.

The files to be transated are:

http://code.google.com/p/hedgewars/source/browse/project_files/HedgewarsMobile/Locale/English.lproj/About.strings
http://code.google.com/p/hedgewars/source/browse/project_files/HedgewarsMobile/Locale/English.lproj/Localizable.strings
http://code.google.com/p/hedgewars/source/browse/project_files/HedgewarsMobile/Locale/English.lproj/Scheme.strings
http://code.google.com/p/hedgewars/source/browse/project_files/HedgewarsMobile/Locale/hw-desc_en.txt

The format is "XXX" = "YYY"; where XXX is the original word in English, while YYY is your translation.