Add missing aria-labels for buttons

index.php

@@ -441,14 +441,14 @@
                 <p><label class="switch"><input type="checkbox" checked="checked" id="tgl_roomid" autocomplete="off"><span class="sliderToggle round"></span></label> <label for="tgl_roomid" lang="de" data-lang-token="tgl_roomid">Raumnummern</label></p>
                 <p><label class="switch"><input type="checkbox" id="tgl_lbl" checked="checked" autocomplete="off"><span class="sliderToggle round"></span></label> <label for="tgl_lbl" lang="de" data-lang-token="tgl_lbl">Systematik</label></p>
                 <p><label class="switch"><input type="checkbox" id="tgl_staffview" autocomplete="off"><span class="sliderToggle round"></span></label> <label for="tgl_staffview" lang="de" data-lang-token="tgl_staffview">Spezial</label></p>
-                <p><button id="savePng" lang="de" data-lang-token="downloadPng" style="margin: auto auto;">Pläne herunterladen</button></p>
+                <p><button id="savePng" lang="de" data-lang-token="downloadPng" style="margin: auto auto;" aria-label="Download maps">Pläne herunterladen</button></p>
             </div>
             <button id="widget_btn_settings" class="iconbutton" aria-label="Show settings"><svg class="icon"><use xlink:href="res/symbols.svg#icon-cog"></use></svg></button>
         </div>
         <div id="widget-zoom">
-            <button class="zoom-in btn_zoom" title="Zoom In">+</button>
-            <button class="zoom-reset btn_zoom" title="Reset Zoom">Reset</button>
-            <button class="zoom-out btn_zoom" title="Zoom Out">-</button>
+            <button class="zoom-in btn_zoom" title="Zoom In" aria-label="Zoom in">+</button>
+            <button class="zoom-reset btn_zoom" title="Reset Zoom" aria-label="Reset zoom">Reset</button>
+            <button class="zoom-out btn_zoom" title="Zoom Out" aria-label="Zoom out">-</button>
         </div>
     </div>
 </div>