chore: add a period at the end of the meta info

Author: cotes2020

_data/locales/en.yml

@@ -40,7 +40,7 @@ copyright:
     Except where otherwise noted, the blog posts on this site are licensed
     under the Creative Commons Attribution 4.0 International (CC BY 4.0) License by the author.
 
-meta: Using the :THEME theme for :PLATFORM
+meta: Using the :THEME theme for :PLATFORM.
 
 not_found:
   statment: Sorry, we've misplaced that URL or it's pointing to something that doesn't exist.