Go back to using a configurable link for documentation

The message allows per-wiki configuration. The default target is better
for normal users of TemplateData than the previous hard-coded one and
has already been translated in some languages from when it was used
previously.

This also moves the messages dependencies from `ext.templateData` to
`ext.templateDataGenerator.ui`, which is the only module that uses
them: the correct strings were displayed only by inheritance.

Bug: T112011
Change-Id: I81ab684bb0ed9b0767df75635284c51129ac7000

extension.json

@@ -61,12 +61,6 @@
 			],
 			"dependencies": [
 				"ext.templateDataGenerator.ui"
-			],
-			"messages": [
-				"templatedata-editbutton",
-				"templatedata-helplink",
-				"templatedata-helplink-target",
-				"templatedata-errormsg-jsonbadformat"
 			]
 		},
 		"ext.templateDataGenerator.data": {
@@ -99,6 +93,8 @@
 			"messages": [
 				"comma-separator",
 				"templatedata-doc-no-params-set",
+				"templatedata-editbutton",
+				"templatedata-errormsg-jsonbadformat",
 				"templatedata-exists-on-related-page",
 				"templatedata-modal-button-add-language",
 				"templatedata-modal-button-addparam",
@@ -153,7 +149,9 @@
 				"templatedata-modal-title-paramorder",
 				"templatedata-modal-title-templatedesc",
 				"templatedata-modal-title-templateparam-details",
-				"templatedata-modal-title-templateparams"
+				"templatedata-modal-title-templateparams",
+				"templatedata-helplink",
+				"templatedata-helplink-target"
 			]
 		}
 	},

modules/ext.templateDataGenerator.ui.js

@@ -203,7 +203,7 @@
 				editHelpButtonWidget = new OO.ui.ButtonWidget( {
 					label: mw.msg( 'templatedata-helplink' ),
 					classes: [ 'tdg-editscreen-main-helplink' ],
-					href: 'https://www.mediawiki.org/wiki/Extension:TemplateData',
+					href: mw.msg( 'templatedata-helplink-target' ),
 					target: '_blank',
 					framed: false
 				} );