The bug
When opening the burger menu of minecraft.net (three horizontal bars at the top right) and clicking the "Download" tab on the left, it opens https://my.minecraft.net/store/minecraft/ (note the missing locale), which then uses the browser language instead of the language currently selected on minecraft.net.
E.g. if your browser language is English, but you are viewing the site in Spanish (https://www.minecraft.net/es-es/), it will open the store site in English.
I made the report more generic since it does not only affect the Spanish version. I hope you are fine with this.