Setting (via Project Properties > Package > Assembly neutral language or manually in .csproj)

<PropertyGroup>
  <NeutralLanguage>de</NeutralLanguage>
</PropertyGroup>

leads to strange (mixed) localization behavior at runtime; localization works as expected while leaving this setting empty (or setting to (None) in the Properties GUI).

• Introduce JS6 modules.
• Define the (solved) problem, specify the requirements (on a GitHub board).
• Describe architecture.
• Describe coding conventions (.editorconfig, CONTRIBUTING.md).
• Describe visual design (a la Material studies).
• Automate versioning (if not done yet; in YEAR.MONTH.DAY schema).
• Add Angular (convert JS stuff to TypeScript) / React / Vue / Blazor implementations
• Refactor style sheets (switch to BEM; try SASS / LESS).
• Add code reviews (of my own code, written some time ago).
• Redraw logo, icons, and illustrations.
• Animate icons (s. How SVG Line Animation Works)?
• Enhance responsiveness?
• Implement random color palette.