Improve accessibility (part 3) (#4405)

* fix(compose): Add aria-label for the navigation links

* fix(search): Add input label

* fix(navigation_bar): Link description

* fix(autosuggest_textarea): Add input label

* fix(compose_form): Add input label

* fix(upload_button): Add input label

* fix(account/header): Add link content

* fix(column_header): Use h1 tag

* fix(column_header): Labels move buttons moving column

* fix(settings_text): Add label to input

* fix(column_header): Remove role from h1

* fix(modal_root): Use role=dialog

* fix(modal_root): Focus restauration

* fix(modal_root): Apply inert to sibligs

* fix(column_header): Add role=button

* chore(eslint): Disable jsx-a11y/label-has-for

app/javascript/mastodon/locales/defaultMessages.json

@@ -61,6 +61,14 @@
         "defaultMessage": "Hide settings",
         "id": "column_header.hide_settings"
       },
+      {
+        "defaultMessage": "Move column to the left",
+        "id": "column_header.moveLeft_settings"
+      },
+      {
+        "defaultMessage": "Move column to the right",
+        "id": "column_header.moveRight_settings"
+      },
       {
         "defaultMessage": "Unpin",
         "id": "column_header.unpin"