If you use a Power BI Embedded Application (App owns data), the App runs in an English environment. But if your users need another language, you must enable the translation.
Okay, the following report is deployed on the Power BI tenant:
At your Embedded Application you can set that your app runs in another language and you can set the format. This information will be sent to the PBI tenant. If you also set some meta data translations, these data will be also translated.
When you run your application with these settings, your meta data and the report will be translated. The good thing is, when you use an A1 Power BI Embedded plan, you will also get the meta data translation. This option is normally with an P1 or higher SKU available.