chore(translation): add OpenStreetMap hint (#463)

* chore(translation): add OpenStreetMap hint

Add OpenStreetMap hint to popup

* Remove font-family from label

Author: mpfeil

app/styles/main.css

@@ -1929,7 +1929,6 @@ nav > a.active {
 
 .small {
   font-size: 0.8em;
-  font-family: BrixSlab-Regular;
 }
 
 .small #dont-show-again {

app/views/donation.html

@@ -1,12 +1,7 @@
 <div class="donation-wrapper">
   <div class="donation-text">
-    <!-- <h3>{{'INFO_SUPPORT' | translate}}</h3> -->
     <div ng-bind-html="'INFO_SUPPORT_TEXT' | translate"></div>
   </div>
-  <!-- <iframe
-    class="external-help"
-    ng-src="{{ help.iframeSrc }}"
-    sandbox="allow-same-origin"></iframe> -->
 
   <div class="donation-footer">
     <div class="small">
@@ -16,5 +11,8 @@
     <div>
       <a href="https://www.betterplace.org/de/projects/89947-opensensemap-org-die-freie-karte-fuer-umweltdaten" target="_blank" class="btn donation-button">{{'INFO_DONATE_NOW'|translate}}</a>
     </div>
+    <blockquote style="margin-top: 30px;">
+      <footer>{{'INFO_OSM_HINT' | translate}}</footer>
+    </blockquote>
   </div>
 </div>