[TASK][EM] More readable "time since last update"-strings

The extensionmanager now shows the time elapsed since the last update,
not the time of the last update. The time of the last update is still
shown in a tooltip. Some english localizations have changed.

Resolves: #46524
Related: #39921
Releases: 6.1
Change-Id: I2d5c6e8099e6973826debfcf2cbb597c35bb499c
Reviewed-on: https://review.typo3.org/19116
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
[BUGFIX] Warning empty $GLOBALS['TCA'] in rootline utility

The TCA refactoring of issue #45767 introduced a warning in the
rootline utility: Rootline resolving is called by determineID in
index_ts. At this point in bootstrap the TCA was not loaded yet.
The patch just moves the TCA includes prior to determineID.

Warning: This leads to an earlier execution of ext_tables.php if
caches are empty. 6.0 did that too, it called includeTca()
in RootlineUtility to circumvent the same issue, the current patch
just solves the issue in a cleaner way. But still, this might lead
to problems if ext_tables.php code relies for example on the setup
done by determineID or the other code in between. The risk this
breaks something is pretty low, though.

Change-Id: I83e6367dbb4654fe0bf957bbe817fa6d5b5ea106
Resolves: #46156
Related: #45767
Releases: 6.1
Reviewed-on: https://review.typo3.org/19200
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
[TASK][EM] Truncate table if updating extension list

If updating the TER extension list, em deletes all rows of the table
with entries of the specific repository. Since EM handles the main
repository only, truncate can be used here, which is quicker.

Change-Id: Id0dc4fb57d68346f372c44d8cbee247072d09548
Resolves: #46569
Releases: 6.1
Reviewed-on: https://review.typo3.org/19199
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn