i18n for OAuth providers

[ikovic]

Description

Expose OAuth provider names as i18n strings:

  "provider.google": "Google",
  "provider.facebook": "Facebook",
  "provider.github": "GitHub",
  "provider.gitlab": "GitLab",
  "provider.line": "LINE",
  "provider.bitbucket": "Bitbucket",
  "provider.azuread": "Microsoft",
  "provider.okta": "Okta",
  "provider.apple": "Apple",
  "provider.saml": "SAML"

The default values are consistent with the previously hardcoded values, except for azuread which is now Microsoft.

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have generated the new version of the docs website and smoke tested it
• I have checked that my changes haven't caused semantic errors in the existing docs
• I have generated a changeset if my change affects the published packages

[github-actions]

Bundle size comparison

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
main.js	+0.03%	395.15 kB	395.26 kB	+0.05%	103.97 kB	104.02 kB
style.css	-0.09%	38.17 kB	38.14 kB	-0.21%	6.48 kB	6.47 kB
main.d.ts	=	5.63 kB	5.63 kB	=	1.39 kB	1.39 kB

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