[TASK] Use speaking keys for new menu types

The new menu "categories-based tt_content menu" uses a "speaking" key
for its type. The same should be applied to the other new menu type
introduced in TYPO3 CMS 6.2 (i.e. categories-based page menu).

Resolves: #54611
Releases: 6.2
Change-Id: I489a528050dcfeef83c1919155a3b11e599b195c
Reviewed-on: https://review.typo3.org/26566
Reviewed-by: Markus Klein
Reviewed-by: Wouter Wolters
Reviewed-by: Michiel Roos
Reviewed-by: Francois Suter
Tested-by: Francois Suter