[BUGFIX] Different button behaviour Page module views

In the Page module the button behaviour for adding new content elements
"Add a new record at this place" is different in the "columns" and
"languages" view.

The columns view shows the all buttons in a column when hovering over this
column, the languages view will show one button when hovering over this
hidden button. A backend user needs to know where the button is.

The languages view should have the same behaviour as the columns view.

Change-Id: Ia1b98de5b8622c7586bd03e7769ba4aa39121e38
Resolves: #56722
Releases: 6.2, 6.1
Related: #56720
Reviewed-on: https://review.typo3.org/28219
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind
[BUGFIX] Language labels taken from wrong language file

The module "Pagetree overview" in Web > Info is showing an empty
selectbox because the language labels for this dropdown are called from
the wrong language file.

This patch changes the calls to the language labels

Change-Id: I791598933704752fd6d5ed0d987f43bde1811452
Resolves: #56762
Releases: 6.2
Reviewed-on: https://review.typo3.org/28255
Reviewed-by: Sebastian Müller
Tested-by: Sebastian Müller
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
[BUGFIX] Remove baseUri from the Storage

The baseUri in the Storage has a Getter and is the
only thing initialized in the "processConfiguration"
method of a Storage. Due to the fact that "baseUri"
is not a field in the storage-table this never could
be set, and therefore always has been null.

It appears that this has been a left over from earlier
days and it is save to remove this, since the getter
always returned NULL (and as a result was unusable).
In addition the processConfiguration and its signals
are removed as they have and never had an effect anyhow.

Change-Id: I3416ee393a1eb3d0f1ea5fc588a351bb1555cdba
Releases: 6.2
Resolves: #56783
Reviewed-on: https://review.typo3.org/28271
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter
[TEST] Split functional workspaces tests

Change-Id: Ib5e67e6793adb9d7896ce89872ccfa080ca849bd