Move string to Markdown for translation purposes.

Author: kattni

docs/en/index.md

@@ -122,8 +122,16 @@ BeeWare is supported by users like you! Every little bit helps: [click here to c
 
 ### Upcoming events
 
+{% if upcoming_events(files) == None %}
+
+Nothing at the moment...
+
+{% else %}
+
 {{ upcoming_events(files) }}
 
+{% endif %}
+
 ### Documentation
 
 <div class="index-docs" markdown="1">

docs/macros.py

@@ -289,7 +289,7 @@ def upcoming_events(files):
 
         if events:
             return "\n".join(item[1] for item in sorted(events)[:5])
-        return "Nothing at the moment..."
+        return None
 
     @env.macro
     def latest_news(files):