[BUGFIX] Adjust category exception message to namespaces

The exception message in ExtensionManagementUtility::makeCategorizable
now refers to namespaces instead of t3lib.

Fixes: #42996
Releases: 6.1, 6.0

Change-Id: Ifd52a2fb96335fa9bde6ec98b6ddcf8dd4c6bf74
Reviewed-on: https://review.typo3.org/16451
Reviewed-by: Steffen Ritter
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack
Reviewed-on: https://review.typo3.org/19727
[BUGFIX] Function buildUrl does not handle port setting

The function buildUrl in the TYPO3\CMS\Core\Utility\HttpUtility class
does not handle any port setting. This has to be added after the host
setting separated by a colon.

Change-Id: Ie2b24dd076b8abc79ababbd19d6699d6a9fb47a3
Fixes: #47012
Releases: 6.1, 6.0, 4.7
Reviewed-on: https://review.typo3.org/19726
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn