Correct guidance on how to translate the content (#40)

* Fixed the wrong punctuation mark

Correct punctuation: Changed '?' to '.' to properly reflect a statement.

* Correct guidance on how to translate the content

---------

Co-authored-by: Oriol Abril-Pla <oriol.abril.pla@gmail.com>

Author: speco29

README.md

@@ -67,4 +67,4 @@ sphinx-intl update -p unconference/_build/gettext -l es
 needed with `gettext` as shown above. `-l` flag is what indicates what languages should be
 created/updated.
 
-The content can then be translated: locally with poedit or via transifex/crowdin?
+The content can then be translated locally with an editor compatible with `.po` files such as [poedit](https://poedit.net/).