Revert "Fix the tests"

This reverts commit a9dd8ced765eef34ac34f640d13ca01c40db7426.
Revert "Add a "e" prefix to avoid issue when reaching the ID 46656"

This reverts commit e730c552c0b6095a8962f29a114069fb335d7ec6.
Remove useless coma
Using uppercase is less problematic, when including directly the blog under / to avoid clash with other URLs like /admin/
Preparing tests for the default URL shortener backend
Cover the default backend for the URL shortener