Add strings catalog and update strings to be keyed (#500)

* Set up and start main content view

* Continue

* Setup flow

* No secure storage view

* Delete

* Detail

* Rename

* More create

* Empty.

* List

* Main app

* Agent and bump

* .

Sources/Packages/Package.swift

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "SecretivePackages",
     platforms: [
-        .macOS(.v11)
+        .macOS(.v12)
     ],
     products: [
         .library(