[BUGFIX] Do not show message "Allowed file extensions" for internal_type="db"

For IRRE relations with a "foreign_selector" relation set to a field of
type "group" and internal_type "db", the backend wrongly rendered the
message "Allowed file extensions". Instead "Allowed relations" is now
shown for table relations.

Resolves: #87747
Releases: master, 9.5, 8.7
Change-Id: I8a3b7686af14821ece0f727601c1a1bc0d5e1953
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/60830


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Tobi Kretschmann <tobi@tobishome.de>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>

typo3/sysext/backend/Classes/Form/Container/InlineControlContainer.php

@@ -565,7 +565,8 @@ class InlineControlContainer extends AbstractContainer
 
         $item = '<div class="form-control-wrap t3js-inline-controls">' . $item . '</div>';
         $allowedList = '';
-        $allowedLabel = htmlspecialchars($languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.allowedFileExtensions'));
+        $allowedLabelKey = ($mode === 'file') ? 'allowedFileExtensions' : 'allowedRelations';
+        $allowedLabel = htmlspecialchars($languageService->sL('LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.' . $allowedLabelKey));
         foreach ($allowedArray as $allowedItem) {
             $allowedList .= '<span class="label label-success">' . strtoupper($allowedItem) . '</span> ';
         }

typo3/sysext/core/Resources/Private/Language/locallang_core.xlf

@@ -1035,6 +1035,9 @@ Do you want to refresh it now?</source>
 			<trans-unit id="cm.allowEmbedSources">
 				<source>Allowed media sources</source>
 			</trans-unit>
+			<trans-unit id="cm.allowedRelations">
+				<source>Allowed relations</source>
+			</trans-unit>
 			<trans-unit id="sortable.dragmove">
 				<source>Drag to move</source>
 			</trans-unit>