Index: typo3/sysext/lang/lang.php
===================================================================
--- typo3/sysext/lang/lang.php	(revision 10275)
+++ typo3/sysext/lang/lang.php	(working copy)
@@ -409,24 +409,34 @@
 							// 1 => type from (alttitle, description, details, syntax, image_descr,image,seeAlso),
 							// 2 => special instruction, see switch construct
 						$kParts = explode('.', $lkey);
+						$kPartsCount = count($kParts);
+						$specialInstruction = ($kParts[$kPartsCount - 1] == '+') ? TRUE : FALSE;
+						if ($specialInstruction) {
+							array_pop($kParts);
+						}
 
+						if ($kPartsCount > 2) {
+							$type = array_pop($kParts);
+							$fieldName = implode('.', $kParts);
+						} else {
+							$fieldName = $kParts[0];
+							$type = $kParts[1];
+						}
+
 							// Detecting 'hidden' labels, converting to normal fieldname
-						if ($kParts[0] == '_') {
-							$kParts[0] = '';
+						if ($fieldName == '_') {
+							$fieldName = '';
 						}
-						if (substr($kParts[0], 0, 1) == '_') {
-							$kParts[0] = substr($kParts[0], 1);
+						if (substr($fieldName, 0, 1) == '_') {
+							$fieldName = substr($fieldName, 1);
 						}
 
 							// Add label:
-						switch ((string)$kParts[2]) {
-								// adding
-							case '+':
-								$TCA_DESCR[$table]['columns'][$kParts[0]][$kParts[1]] .= LF . $lVal;
-								break;
+						if ($specialInstruction) {
+							$TCA_DESCR[$table]['columns'][$fieldName][$type] .= LF . $lVal;
+						} else {
 								// Substituting:
-							default:
-								$TCA_DESCR[$table]['columns'][$kParts[0]][$kParts[1]] = $lVal;
+							$TCA_DESCR[$table]['columns'][$fieldName][$type] = $lVal;
 						}
 					}
 				}