Bugfix: Document Blueprints are not named consistently

[iOvergaard]

Changes

• Following the changes in PR Feature/blueprint #893 the en.ts file was introduced with the former name of Document Blueprints (content templates). This has been corrected.
• Introduced a routable workspace for blueprint root so that the previously hidden element detailing how to use blueprints is now being shown
• Introduced new variables to account for new texts in the Create modal
• Replaced static texts with localization keys everywhere I could think of

Fixes umbraco/Umbraco-CMS#16410

How to test

• Check that all static texts are localized
• Try to create a Folder and check that the name of the folder is used correctly in the Create dialog when creating a new blueprint underneath a folder
• Check that notifications show the correct localization when creating, deleting, etc.

Screenshots

[leekelleher]

Tested out, works as expected! 🚀