Add warning about blog only being available in english

src/pages/blog.php

@@ -14,6 +14,17 @@ $page->bodyStart();
 $page->navigation();
 
 $posts = Blog::getPosts();
+
+if ('en' !== \Locale::getPrimaryLanguage($user->locale)) {
+    $page->messages[] = Page::warning(
+        sprintf(
+            /** TRANSLATORS: %s: Language, most likely English */
+            __('The blog is currently only available in %s and not translateable. Please let me know if you have any ideas to improve this.'),
+            '<strong>' . \Locale::getDisplayName('en', 'en') . '</strong>'
+        ),
+        __('Warning')
+    );
+}
 ?>
 
 <main>

src/pages/post.php

@@ -32,6 +32,8 @@ $page->navigation();
 
 <main>
     <div class="ui text container">
+        <?= $page->messages() ?>
+
         <div class="ui segments">
             <div class="ui fitted segment image">
                 <?= $postMediaHTML ?>