IBX-10198: Share button is moving for empty content title

Author: OstafinL

src/bundle/Resources/translations/ibexa_content_edit.en.xliff

@@ -26,6 +26,11 @@
         <target state="new">Content published.</target>
         <note>key: content.published.success</note>
       </trans-unit>
+      <trans-unit id="3f953d15b951d613c3b973522fbbf48ddd314489" resname="content.title.empty_title_placeholder">
+        <source>[Untitled]</source>
+        <target state="new">[Untitled]</target>
+        <note>key: content.title.empty_title_placeholder</note>
+      </trans-unit>
       <trans-unit id="f34946beab1da2af6535a8e4a88145e9557de0aa" resname="editing">
         <source>Editing</source>
         <target state="new">Editing</target>

src/bundle/Resources/views/themes/admin/ui/edit_header.html.twig

@@ -3,6 +3,7 @@
 {% set content = content|default(null) %}
 {% set show_extra_bottom_content = show_extra_bottom_content|default(false) %}
 {% set is_user_content_type = content_type is defined and content_type.identifier in ibexa_admin_ui_config.userContentTypes %}
+{% set emptyTitlePlaceholder = 'content.title.empty_title_placeholder'|trans|desc('[Untitled]') %}
 
 <div class="ibexa-edit-header {{ show_extra_bottom_content ? 'ibexa-edit-header--has-extra-content' }}">
     <div class="ibexa-edit-header__containers">
@@ -38,7 +39,7 @@
         </div>
         <div class="ibexa-edit-header__container ibexa-edit-header__container--details">
             <div class="ibexa-edit-header__title-section">
-                <h1 class="ibexa-edit-header__title">{{ title }}</h1>
+                <h1 class="ibexa-edit-header__title">{{ title|default(emptyTitlePlaceholder) }}</h1>
                 <div class="ibexa-edit-header__after-title">
                     {% block after_title %}{% endblock %}
                 </div>