Issue #3190741 by swentel, nedjo: Theme can't be installed at Appearance

README.md

@@ -23,7 +23,7 @@ Modules that implement the API:
 - Enable the Reader theme at Appearance
 - Go to the block layout of the reader them and make sure following blocks are
   installed:
-    - Main content in column 1
+    - Main content in content
     - Reader channels in column 2
     - Reader create links in column 3
     - Reader actions in actions

themes/reader_theme/reader_theme.info.yml

@@ -8,7 +8,7 @@ type: theme
 base theme: stable
 
 regions:
-  column_1: Column 1 (content)
+  content: Column 1 (content)
   column_2: Column 2
   column_3: Column 3
   actions: Actions

themes/reader_theme/templates/page.html.twig

@@ -21,7 +21,7 @@
             <div class="column-header__collapsible search-container collapsed"><div class="column-header__collapsible-inner"><div class="column-header__collapsible__extra">{{ page.search }}</div></div></div>
           </div>
           <div class="scrollable">
-            {{ page.column_1 }}
+            {{ page.content }}
           </div>
           {% if page.messages %}
             {{ page.messages }}