Make fridge magnets look more like magnets.

src/server/gwt/src/se/chalmers/cs/gf/gwt/client/FridgeApp.java

@@ -102,7 +102,9 @@ public class FridgeApp extends TranslateApp {
 			String inputLanguage = pgf.getInputLanguage();
 			clear();
 			for (String word : text.split("\\s+")) {
-				add(new UsedMagnet(inputLanguage, word));
+				if (word.length() > 0) {
+					add(new UsedMagnet(inputLanguage, word));
+				}
 			}
 		}
 

src/server/gwt/src/se/chalmers/cs/gf/gwt/public/Fridge.css

@@ -17,7 +17,17 @@
 .my-Magnet, .my-UsedMagnet {
   float: left;
   margin: 0.3em;
+  border-width: 1px 3px 3px 1px;
+  border-style: solid;
+  border-color: black;
   padding: 0.3em;
+  color: black;
+  background-color: white;
+}
+
+.my-Magnet a, .my-UsedMagnet a {
+  color: black;
+  text-decoration: none;
 }
 
 .my-translations {