Merge pull request #11 from clariah-grlc-sustainability/cosmetic-changes

replaces add filter button labels with '+'

index.html

@@ -44,7 +44,7 @@
                                 </div>
                             </div>
                         </div>
-                        <button id="add-filter">Add Attribute Filter</button>
+                        <button id="add-filter">+</button>
                     </div>
                 </div>
 
@@ -85,7 +85,7 @@
                                 </div>
                             </div>
                         </div>
-                        <button id="add-value-filter">Add Value Range Filter</button>                
+                        <button id="add-value-filter">+</button>                
                     </div>
                 </div>
 
@@ -115,7 +115,7 @@
                                 </div>
                             </div>
                         </div>
-                        <button id="add-regex-filter">Add String Match Filter</button>
+                        <button id="add-regex-filter">+</button>
                     </div>
                 </div>
 
@@ -142,7 +142,7 @@
                                 </div>
                             </div>
                         </div>
-                        <button id="add-show-attribute">Add Show Attribute</button>
+                        <button id="add-show-attribute">+</button>
                     </div>
                 </div>