Issue #2047227 by StephaneQ, SeanKelly, richardj: Update templates to leverage...

Issue #2047227 by StephaneQ, SeanKelly, richardj: Update templates to leverage support for the Twig {% trans %} tag extension.

core/modules/aggregator/templates/aggregator-summary-items.html.twig

@@ -19,5 +19,5 @@
 <h3>{{ title }}</h3>
 {{ summary_list }}
 <div class="links">
-  <a href="{{ source_url }}">{{ 'More<span class="visually-hidden"> posts about %title</span>'|t({ '%title': title }) }}</a>
+  <a href="{{ source_url }}">{% trans %}More<span class="visually-hidden"> posts about {{ title|placeholder }}</span>{% endtrans %}</a>
 </div>

core/modules/datetime/templates/datetime-wrapper.html.twig

@@ -17,7 +17,7 @@
 #}
 {% if title %}
   <h4 class="label">
-    {{ '!title!required'|t({ '!title': title, '!required': required }) }}
+    {% trans %}{{ title|passthrough }}{{ required|passthrough }}{% endtrans %}
   </h4>
 {% endif %}
 {{ content }}

core/modules/forum/templates/forum-submitted.html.twig

@@ -17,7 +17,7 @@
  */
 #}
 {% if time %}
-  <span class="submitted">{{ 'By !author @time ago'|t({'@time': time, '!author': author}) }}</span>
+  <span class="submitted">{% trans %}By {{ author|passthrough }} {{ time }} ago{% endtrans %}</span>
 {% else %}
   {{ 'n/a'|t }}
 {% endif %}

core/modules/locale/templates/locale-translation-last-check.html.twig

@@ -17,7 +17,7 @@
 <div class="locale checked">
   <p>
   {% if last_checked %}
-    {{ 'Last checked: @time ago'|t({'@time': time}) }}
+    {% trans %} Last checked: {{ time }} ago {% endtrans %}
   {% else %}
     {{ 'Last checked: never'|t }}
   {% endif %}

core/modules/locale/templates/locale-translation-update-info.html.twig

@@ -21,7 +21,8 @@
 <div class="inner" tabindex="0" role="button">
   <span class="update-description-prefix visually-hidden">Show description</span>
   {% if modules %}
-    <span class="text">{{ 'Updates for: @modules'|t({'@modules': modules|join(', ')}) }}</span>
+    {% set module_list = modules|join(', ') %}
+    <span class="text">{% trans %}Updates for: {{ module_list }}{% endtrans %}</span>
   {% elseif missing_updates_status %}
     <span class="text">{{ missing_updates_status }}</span>
   {% endif %}