- Cleanup SPA templates slightly
- add missing `description`s
- add `id` for `postActions`
- add and correct `$schema` properties
- generalize vs-2017.3.host.json filename to ide.host.json
- Add templatestrings.*.json files
- step 3/4 (yeah, not just of 3) for dotnet/aspnetcore#36998 in this repo
- without this, id's are **not** automatically kept up to date
- see <https://github.com/dotnet/templating/wiki/Localization>
- see also dotnet/aspnetcore#38867 (a similar update in dotnet/aspnetcore)
- Move existing translations from old files to new
- {lang}/strings.json to templatestrings.{lang}.json
- Remove redundant strings.json files
- templatestrings.{lang}.json files are enough
- see also dotnet/aspnetcore#40128 (a similar update in dotnet/aspnetcore)
- Clean up ide.host.json files
- per PR review comments
