Improve RegEx button in vc builder

Change-Id: Iea748a41b78e4112a1e884b9b0ca6be05c5332e8
diff --git a/dev/js/src/loc/de.js b/dev/js/src/loc/de.js
index 21bf629..6daed13 100644
--- a/dev/js/src/loc/de.js
+++ b/dev/js/src/loc/de.js
@@ -10,6 +10,9 @@
   loc.VC_allCorpora = 'allen Korpora';
   loc.VC_oneCollection = 'einem virtuellen Korpus';
 
+  // Regex:
+  loc.REGEX_DESC = loc.REGEX_DESC || 'Regulären Ausdruck verwenden';
+
   // Date picker:
   loc.WDAY = ['Mo', 'Di', 'Mi', 'Do', 'Fr', 'Sa', 'So'];
   loc.MONTH = [