Consider your location, logistic & service capabilities, and examine data from your analytic tools to see from where most of your visitors come. Determine the languages you want to translate based on the countries/markets you can enter relatively quickly. Consider the cost/benefit ratio of the target market size against the resources needed to serve the market.
Suppose you focus on a specific geographic area. In that case, you may want to first localize your product into languages spoken in that region, starting with the official languages and those which are vastly adopted or mandatory. Later, you can focus on adding the languages of the foreign citizens and minorities who are likely to spend some time in the region.
You can find which languages are spoken in particular regions in the Localazy Hub.
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