[TASK] Improve backend module Form description

This commit improves description text for backend module Form by replacing
reference to "Mail Form" content element with just "Form" as this name is
used in TYPO3.

Resolves: #91352
Releases: master, 9.5
Change-Id: I3348d2766afad6a2c06ce7b323df775a9bf9c33b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64442


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>

typo3/sysext/form/Resources/Private/Language/locallang_module.xlf

@@ -7,7 +7,7 @@
                 <source>Build custom forms</source>
             </trans-unit>
             <trans-unit id="mlang_labels_tabdescr" resname="mlang_labels_tabdescr">
-                <source>This module ships a flexible and user-friendly form editor. It allows you to build and create versatile forms for your frontend. Your forms can easily be added to any page by using the content element "Mail Form". Within this element, finishers can be overridden.</source>
+                <source>This module ships a flexible and user-friendly form editor. It allows you to build and create versatile forms for your frontend. Your forms can easily be added to any page by using the content element "Form". Within this element, finishers can be overridden.</source>
             </trans-unit>
             <trans-unit id="mlang_tabs_tab" resname="mlang_tabs_tab">
                 <source>Forms</source>