Update to new home - pallets-eco

- Change all references to Flask-Security-Too to Flask-Security
- update codecov
- update badges
- regenerate translations
- continue finding places that need branch name changed to main

.github/workflows/tests.yml

@@ -4,11 +4,11 @@ name: tests
 on:
   push:
     branches:
-      - master
+      - main
       - "[0-9]+.[0-9]+.x"
   pull_request:
     branches:
-      - master
+      - main
       - "[0-9]+.[0-9]+.x"
 
   # Allows you to run this workflow manually from the Actions tab