Pontoon: Update Latvian (lv) localization of Pontoon Intro
Pontoon: Update Latvian (lv) localization of Pontoon Intro

Localization authors:
- iesalnieksdavis <iesalnieksdavis@gmail.com>
- orvils <orvils@gmail.com>
- Jānis Marks Gailis - Jean-Marc <jm-gailis@fai-vianet.fr>

jotes/pontoon-intro,jotes/pontoon-intro,jotes/pontoon-intro