[BUGFIX] Wrong HTML in locallang_csh_pages.xlf

lang/4.5/locallang_csh_pages.xlf contains invalid
HTML structure a <p> tag should actually be a <b> tag.

Resolves: #58936
Releases: 6.2, 6.1, 4.5
Change-Id: Id37d424296628202d8d434e0cf9cafd8529da2c3
Reviewed-on: https://review.typo3.org/30330
Reviewed-by: Markus Klein
Tested-by: Markus Klein