[ticket/13223] Fix USERNAME email template variable in notification
admin_activate_user.php notification type is assigning usernames to email
template variables using user_loader->get_username() in 'no_profile' mode,
which in its turn calls get_username_string() function in 'no_profile' mode.
This causes HTML markup in emails for username colour.
phpbb_profilefield_type_string_test::test_validate_profile_field with data set #12 ('ö äö äö ä', array('[\\w]+'), 'FIELD_INVALID_CHARS_ALPHA_ONLY-field', 'Required field should reject UTF-8 in alpha only field')
Required field should reject UTF-8 in alpha only field
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-FIELD_INVALID_CHARS_ALPHA_ONLY-field
+FIELD_INVALID_CHARS_ALPHA_UNDERSCORE-field
(2 more lines...)
