Reasons for creating this PR

@CaptSolo updated some Latvian translations in Transifex. This PR brings them in to Skosmos 2.

Link to relevant issue(s), if any

• Closes Latvian translation update (Transifex) #1643

Description of the changes in this PR

• a couple of new translations in Latvian

Known problems or uncertainties in this PR

none

Checklist

• phpUnit tests pass locally with my changes
• I have added tests that show that the new code works, or tests are not relevant for this PR (e.g. only HTML/CSS changes)
• The PR doesn't reduce accessibility of the front-end code (e.g. tab focus, scaling to different resolutions, use of .sr-only class, color contrast)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)