Use sequential numbering for ordered list

Using all `1.` is a workaround to allow reordering large lists without redoing
numbering.

CONTRIBUTING.md

@@ -264,8 +264,8 @@ To pull the latest translations, follow these steps:
 
 1.  Download Transifex client:
     https://docs.transifex.com/client/installing-the-client
-1.  Create Transifex account: https://transifex.com
+2.  Create Transifex account: https://transifex.com
-1.  Generate API token: https://www.transifex.com/user/settings/api/
+3.  Generate API token: https://www.transifex.com/user/settings/api/
-1.  Create `~/.transifexrc` configuration:
+4.  Create `~/.transifexrc` configuration:
     https://docs.transifex.com/client/client-configuration#-transifexrc
-1.  Run `yarn grunt tx`.
+5.  Run `yarn grunt tx`.