Resolve "Outlink Symbole werden nicht (falsch) angezeigt"

Closes #817 (closed)

resources/assets/less/metager/general.less

@@ -246,11 +246,11 @@ summary {
 .inlink {
     &:after {
         display: inline-block;
-        font: normal normal normal 14px/1 FontAwesome;
+        font: normal normal normal 14px/1 'Font Awesome 5 Free';
         font-size: inherit;
         text-rendering: auto;
         -webkit-font-smoothing: antialiased;
-        content: "\f08e";
+        content: "\f35d";
     }
 }
 
@@ -258,11 +258,11 @@ summary {
 .outlink {
     &:after {
         display: inline-block;
-        font: normal normal normal 14px/1 FontAwesome;
+        font: normal normal normal 14px/1 'Font Awesome 5 Free';
         font-size: inherit;
         text-rendering: auto;
         -webkit-font-smoothing: antialiased;
-        content: "\f08e";
+        content: "\f35d";
     }
 }