szrcmk it looks like Bazaar translations aren't loaded inside Flarum to begin with. What language pack are you using ? Did Bazaar text appear prior to using Linguist ?
Did you try clearing the cache manually, via the admin or the command line ?
Could you post the output of
php flarum info ? It would give us flarum version, linguist version and which language pack(s) you have.
What you're doing there in Linguist shouldn't make any difference, English should be used by default if Bazaar isn't translated by your language pack and English text contains the same string you're trying to set.