Add screenshots for translation guide

po/README.md

@@ -27,15 +27,20 @@ git clone git@github.com:mjakeman/extension-manager.git
 
 1. Run GNOME Builder.
 2. Click `Clone Repository` button at the bottom.
+![Click on 'Clone Repository'.](screenshots/_1.png)
 3. In `Repository URL` paste: `https://github.com/mjakeman/extension-manager`
 4. Set `Location` to `~/`
+5. Click `Clone Repository` and wait until it's done.
+![Fill all fields.](screenshots/_2.png)
 
 You can leave GNOME Builder open as we will use it again later.
 
 
 3. You need the `pot` file that lies inside `./po` folder. Make sure that the [pot file is up-to-date](#regenerate-pot-files) before proceeding.
 4. Open it with POEditor.
 5. Click on button at the bottom of window `Create a new translation`, select your desired language.
+![How to make new translation from pot.](screenshots/_3.png)
+![Pick your desired language.](screenshots/_4.png)
 6. Press `Ctrl+S` to save new file, place it inside `./po` folder with filename that POEdit gave you.
 7. Open `./po/LINGUAS` file with any text editor, and add there locale code of your language. For example, if you want to add Ukrainian translation, POEdit will suggest you filename `uk.po`, so in `LINGUAS` file, you need to add `uk`. And, please, keep locale codes in alphabetical order.