Writing in English will make your work accessible to more people. Otherwise translation would be needed.
Eventually you will probably want to publish in a more common language, but you can fairly easily avoid issues in the short term by writing your CV in such a way that you provide the original titles of papers/theses along with English translations.
One advantage of writing originally in English, provided it is grammatically correct, is that it will be easier to convince people in admissions that you are conversant in English, which will be needed most places in Canada and everywhere in US.
Note that in some fields, auto translation like Google Translate does a terrible job; math, for example. It may be better in other fields with a bit less technical terminology.