When adding translations in twig, is the source language always English?

in flag

When adding translatable strings in Twig templates, is it assumed that the string is always written in English and then translated to other languages? Even if there is a different 'base' language or only one (non English) language used on the site?

I've been scouring various docs pages and this is the only time I've come across anything stating this explicitly:

UI text is always put into code and related files in English.


Because the source of translation strings is English, and some words...

I sit in a Tesla and translated this thread with Ai:


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Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.