Update TFA help text to be translatable and allow to translate settings

tfa-8.x-1.0-alpha4.patch

diff --git a/config/schema/tfa.schema.yml b/config/schema/tfa.schema.yml
index 0b52d63..483335a 100644
--- a/config/schema/tfa.schema.yml
+++ b/config/schema/tfa.schema.yml
@@ -62,7 +62,7 @@ tfa.settings:
       type: integer
       label: 'TFA Flood Threshold'
     help_text:
-      type: string
+      type: label
       label: 'Text to display on help page. Plain text only.'
     mail:
       type: config_object
diff --git a/tfa.config_translation.yml b/tfa.config_translation.yml
new file mode 100644
index 0000000..7d4c4e3
--- /dev/null
+++ b/tfa.config_translation.yml
@@ -0,0 +1,5 @@
+tfa.settings:
+  title: 'TFA Settings'
+  base_route_name: tfa.settings
+  names:
+    - tfa.settings
diff --git a/tfa.links.task.yml b/tfa.links.task.yml
index 0671215..e8e6915 100644
--- a/tfa.links.task.yml
+++ b/tfa.links.task.yml
@@ -3,3 +3,8 @@ tfa.overview:
   base_route: entity.user.canonical
   weight: 9
   title: 'Security'
+
+tfa.settings:
+  route_name: tfa.settings
+  title: 'TFA Settings'
+  base_route: tfa.settings