Yes, at my day job, we translated the site from just English to 13 other languages, as it is an international product. We found that we increased revenue by 30% in 2019 due to the new languages. Simply put, there are people in countries such as Germany, France, Italy, Portugal and so forth who speak just their language and not English. Assuming that everyone speaks English is not correct. We have quantitate evidence of this as well as qualitative ones, from the non-English speaking staff that we hired. If your customers are from countries where the official language is not English, it might do you well to internationalize your site.
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