OMF will use any language installed on OpenCart. However, a few words on the mobile site will appear in English only.
Currently, we've only got Arabic and Turkish translations. You can donwload them here: https://braiv.zendesk.com/hc/en-us/articles/202010676-OMF-Language-packs
To translate OMF in another language, please refer to this article: https://braiv.zendesk.com/hc/en-us/articles/201356386-How-to-translate-OMF-in-any-language