Change text when not connected

[michaelWuensch]

Description

Changed a text in the drawer menu header when no wallet is connected. Also made the "no connection" string translatable that was in the bottom of the drawer menu showing the lnd version.

Motivation and Context

The text said "No wallet" but that is confusing if you already have wallets in your list. There is just no working connection to a wallet at the moment. So this is changed now to "No connection".

How Has This Been Tested?

My S9

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Chore

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the Contribution document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.