Add help for email variable

resources/lang/en/texts.php

@@ -2745,6 +2745,7 @@ $LANG = array(
     'upgrade_to_upload_images' => 'Upgrade to the enterprise plan to upload images',
     'delete_image' => 'Delete Image',
     'delete_image_help' => 'Warning: deleting the image will remove it from all proposals.',
+    'amount_variable_help' => 'Note: the invoice $amount field will use the partial/deposit field if set otherwise it will use the invoice balance.',
 
 );
 

resources/views/partials/email_templates.blade.php

@@ -173,6 +173,9 @@
                             </ul>
                         @endif
                     </div>
+                </div><br/>
+                <div class="text-muted">
+                    {{ trans('texts.amount_variable_help') }}
                 </div>
             </div>
             </div>