Fix the language setting for my Shopify store

I have a shopify store that has the the ELLA theme installed, and this theme supported dual language. [login to view URL] I would like to have the store to support english and traditional chinese for the moment, while i may be expand to support a third language in near future. However, at the moment, i am having problem with the translation as some of the wording showed up as weird wording and i don't know how to configure that. I will need some help in order to fix the language display problem. I am open to use the dual language support or adapt to use langify app to support multiple language. I will need this issue solved fairly soon as i would like to open up the store by late next week.