Pssst, if you have Steam/GOG/Origin digital games, then multilingual games automatically download all supported languages.
Although if you are in US there is a chance that there are 2 separate distributions for some games (English or Multilingual) depending on developer/publisher. Even then many games will only have a multilingual distribution available. I believe all distributions in the EU default to multilingual distribution packages.
And multilingual could mean anywhere from all supported languages (EU) or just supported languages for a given country (English/French for Canada for example or English/Spanish/French for the US).
[edit] - In other words, you choose your language after the distribution package is downloaded (all languages downloaded) and not before (only selected language is downloaded).
Regards,
SB