Add poedit as a tool in the README (#94)

README.md

@@ -64,19 +64,33 @@ make html BUILDDIR=build/html-pt_BR O='-d build/doctrees/ -D language=pt_BR'
 
 To update the documentation, follow the steps below:
 
-1. Update the source files for the english version
-2. Extract translatable messages from the english version
+1. Update the source files for the english version.
+2. Extract translatable messages from the english version:
 
 ```shell
 make gettext
 ```
 
-3. Update the message catalog (PO Files) for pt_BR language
+3. Update the message catalog (PO Files) for pt_BR language:
 
 ```shell
 sphinx-intl -c source/conf.py update -p build/gettext -l pt_BR
 ```
 
-4. Translate the messages in the pt_BR language PO files
+4. Translate the messages in the pt_BR `.po` files. You don't need to deal with these files directly
+in your text editor, check the next section for more details.
 
 This workflow is based on the [internationalization feature of Sphinx](http://www.sphinx-doc.org/en/stable/intl.html).
+
+## Useful tools
+
+`.po` files are kinda annoying to handle. Luckily, there are tools that can understand this format
+and provide us a better interface to deal with them. Supposing you are using Ubuntu, you can install
+`poedit`:
+
+```shell
+apt-get install poedit
+```
+
+After running it, you can add the catalog to see all your files in its interface in the
+`Catalog Manager` under the `File` menu.