OO-3608 add striped rows for table color styles

NOTICE.TXT

@@ -22,15 +22,15 @@ Contributors and copy right holders of openolat.org codebase since 2011:
 - frentix GmbH, Switzerland [http://www.frentix.com]
   Michael Enz, Christian Franck, Florian Gnägi, Roman Haag, Joël Krähemann, Matthai Kurian, Stéphane Rossé, 
   Kirsten Scherer, Sergio Trentini, Marco Ferrari, Sabrina Scheiwiler, Oliver Kant, Fabian Kiefer,
-  Urs Hensler
+  Urs Hensler, Mandy Menzel, Saara Welti
 - BPS Bildungsportal Sachsen GmbH, Germany [http://www.bildungsportal.sachsen.de]:
   Armin Blawitzki, Stefan Köber, Sven Morgner
 - VCRP Virtueller Campus Rheinland-Pfalz [http://www.vcrp.de]
-  Stephan Clemenz
+  Stephan Clemenz, Raphael Fetzer, Sabine Hemsing
 - Rain and Hail Agricultural Insurance [http://www.rainhail.com]
   Brooke Hedrick
 - University of Innsbruck, Austria [http://www.uibk.ac.at]
-  Thomas Haselwanter, Guenter Krausgruber, Hermann Schwärzler
+  Thomas Haselwanter, Guenter Krausgruber, Hermann Schwärzler, Daniel Haag
   
 
 OpenOLAT logo and icons

src/main/webapp/static/themes/light/modules/_content_embedded.scss

@@ -72,9 +72,12 @@ div.b_scrollblock {
 		background: darken($bgcolor,10%);
 		font-weight: bold;
 	}	
+	tbody tr:nth-child(even) td {
+		background: lighten($bgcolor,5%);
+		border: 1px solid $bgcolor;
+	}
 }
 
-
 /* nice table formatting */
 table {
 	td {
@@ -147,7 +150,7 @@ table {
 	}
 	&.b_red { 
 		@include o-make-colored-table($o-box-error-bg);
-	}	
+	}
 }
 
 /* font styles  */