Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- config/locales/pl.yml
  Conflict caused by new upstream string too close to glitch-specific
  “flavour” string. Took both strings.

app/lib/proof_provider/keybase/config_serializer.rb

@@ -34,7 +34,7 @@ class ProofProvider::Keybase::ConfigSerializer < ActiveModel::Serializer
   end
 
   def username
-    { min: 1, max: 30, re: '[a-z0-9_]+([a-z0-9_\.-]+[a-z0-9_]+)?' }
+    { min: 1, max: 30, re: '[a-z0-9_]+([a-z0-9_.-]+[a-z0-9_]+)?' }
   end
 
   def prefill_url