Adds a collapsed Texts section to the platform editor's Login editor, for customising different login texts.

dashboard

Add login text overrides to the login editor

Fix an issue where users with production access levels would get an error attempting to fetch tag feeds (with specific parameters), also fix users sometimes getting 500 error instead of the supposed 400

api.staylive.tv

Fix privileged tagged-feed joins and database errors not being reported correctly

Allow platforms to turn off sign up and also make it possible to customise the login/register texts.

Changelog.

Hide email sign-up per platform and override login texts per language