Norwegian fixes

[oyvindwe]

Description

• Lowercase first letter of day and month names
• Correct preposition

Kept the capitalization of the short form of days, as it is only used standalone

Related Issue

This PR fixes or closes issue: fixes #

Motivation and Context

Correct formatting of Norwegian text

How Has This Been Tested

Types of changes

• 🐛 Bug fix (non-breaking change which fixes an issue)
• 🚀 New feature (non-breaking change which adds functionality)
• 🌎 Translation (addition or update for a language)
• ⚙️ Tech (code style improvement, performance improvement or dependencies update)
• 📚 Documentation (fix or addition to documentation)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• I have linted and formatted my code (npm run lint and npm run format)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have tested the change in my local Home Assistant instance.
• I have followed the translation guidelines if I'm adding or updating a translation.