The body touches on common problems in internationalization (i18n) and localization (l10n) which should be familiar to programmers who have done properly internationalized software in the past. The canonical implementation is gettext.

https://www.gnu.org/software/gettext/manual/gettext.html and https://www.gnu.org/software/gettext/manual/html_node/Plural...

The final quote is a one-sided view of the Sapir-Whorf Hypothesis, a fundamental debate in 20th century linguistics.

https://en.wikipedia.org/wiki/Linguistic_relativity

I must say I was excited at the URL because I thought it was a Quarantine remake.

https://en.wikipedia.org/wiki/Quarantine_(video_game)