[FIX] web_editor: de-traw-ify wysiwyg template

`0` should be implicitly markup-safe.

Also migrate the two escs to t-out, there's no reason not to.

addons/web_editor/static/src/xml/wysiwyg.xml

@@ -125,7 +125,7 @@
     <t t-name="wysiwyg.widgets.files.submenu">
         <div class="form-inline align-items-center py-4">
             <t t-call="wysiwyg.widgets.media.search"/>
-            <t t-raw="0"/>
+            <t t-out="0"/>
 
             <input type="file" class="d-none o_file_input" name="upload" t-att-accept="widget.options.accept" t-att-multiple="widget.options.multiImages &amp;&amp; 'multiple'"/>
 
@@ -133,7 +133,7 @@
                 <input type="text" class="form-control o_we_url_input o_we_horizontal_collapse o_we_transition_ease" name="url" t-att-placeholder="urlPlaceholder"/>
                 <div class="input-group-append align-items-center">
                     <button type="button" class="btn btn-secondary o_upload_media_url_button">
-                        <t t-esc="addText"/>
+                        <t t-out="addText"/>
                     </button>
                     <div class="ml-2">
                         <span class="o_we_url_success text-success d-none fa fa-lg fa-check" title="The URL seems valid."/>
@@ -145,7 +145,7 @@
 
             <div class="btn-group">
                 <button type="button" class="btn btn-primary o_upload_media_button">
-                    <t t-esc="uploadText"/>
+                    <t t-out="uploadText"/>
                 </button>
             </div>
         </div>