Application font should default to Segoe UI for Windows Vista and above with themes enabled

[Quppa]

Do you want to request a feature or report a bug?
Feature

What is the current behavior?

• The default application font for Windows Vista and above with themes enabled is Tahoma.
• The default fixed width font is Courier New.
• Fonts within the app are inconsistent in places (hard-coded to Segoe UI, etc.).
• The first-load language selection dialog content overflows available space when Segoe UI is set as the default font.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem.

• Delete GitExtensions.settings and load the application. Note the default fonts in Settings.

What is the expected behavior?

• The default application font for Windows Vista and above with themes enabled should be Segoe UI. It should still be Tahoma for Windows 7 and below when themes are disabled (for Windows 8 and above it should always be Segoe UI). SystemFonts.MessageBoxFont calculates the appropriate value for us.
• Consolas should be the default fixed-width font, replacing Courier New.
• The application should reliably respect the application font setting.
• The first-load language selection dialog content should fit within the window frame.

Environment you encounter the issue:

• GitExtensions version: 2.51
• GIT version: 2.16.2
• OS version: Windows 10 1709 16299.248

Did this work in previous version of GitExtensions (which)?
No.