As per the design system guidelines:
https://github.com/metabrainz/design-system/blob/master/guidelines/style-guidelines.md

e.g. is not as clear as something like "such as" or "for example".
Changed all user-facing places I saw except for some API error strings
in case someone actually depends on the text of those for validation.
Separately changed all appearances I saw on other translatable places,
such as relationship descriptions;
appearances on entity type descriptions left untouched for now
to avoid causing issues with SIR.