fix: spelling

Author: maxceem

src/app/users/terms-dialog.html

@@ -108,7 +108,7 @@ <h2 style="margin-left: 2%;">Not Added Terms</h2>
                             <td>
                                 <button data-ng-click='sign(data)' class="btn btn-sm btn-primary"
                                     ng-disabled="data.adding" ng-if="!isNotAdded(data)">
-                                    <strong>Sing Terms</strong>
+                                    <strong>Sign Terms</strong>
                                 </button>
                             </td>
                         </tr>
@@ -152,4 +152,4 @@ <h2 style="margin-left: 2%;">Not Added Terms</h2>
         ng-show="isRemoving || isAdding">
         <img src="assets/images/loading.gif" />
     </div>
-</div>
+</div>