Merge a17t-redesign, kinda ts-ify setup.js

the web ui has been redesigned with the a17t toolkit, which imo looks a
lot better than bootstrap. This also brought a complete rework of the
web code, which now makes a lot more sense hopefully. the setup page is
still stuck with bootstrap, its not much of a priority but i'll rewrite
it eventually.

lang/form/en-us.json

@@ -0,0 +1,41 @@
+{
+    "meta": {
+        "name": "English (US)"
+    },
+    "strings": {
+        "pageTitle": "Create Jellyfin Account",
+        "createAccountHeader": "Create Account",
+        "accountDetails": "Details",
+        "emailAddress": "Email",
+        "username": "Username",
+        "password": "Password",
+        "reEnterPassword": "Re-enter Password",
+        "reEnterPasswordInvalid": "Passwords are not the same.",
+        "createAccountButton": "Create Account",
+        "passwordRequirementsHeader": "Password Requirements",
+        "successHeader": "Success!",
+        "successContinueButton": "Continue",
+        "validationStrings": {
+            "length": {
+                "singular": "Must have at least {n} character",
+                "plural": "Must have a least {n} characters"
+            },
+            "uppercase": {
+                "singular": "Must have at least {n} uppercase character",
+                "plural": "Must have at least {n} uppercase characters"
+            },
+            "lowercase": {
+                "singular": "Must have at least {n} lowercase character",
+                "plural": "Must have at least {n} lowercase characters"
+            },
+            "number": {
+                "singular": "Must have at least {n} number",
+                "plural": "Must have at least {n} numbers"
+            },
+            "special": {
+                "singular": "Must have at least {n} special character",
+                "plural": "Must have at least {n} special characters"
+            }
+        }
+    }
+}