Add i18n-tasks with adapted config from CodeHarbor

lib/i18n_tasks/js_erb_locale_matcher.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+require 'i18n/tasks/scanners/file_scanner'
+
+module I18nTasks
+  class JsErbLocaleMatcher < I18n::Tasks::Scanners::FileScanner
+    include I18n::Tasks::Scanners::RelativeKeys
+    include I18n::Tasks::Scanners::OccurrenceFromPosition
+
+    # @return [Array<[absolute key, Results::Occurrence]>]
+    def scan_file(path)
+      text = read_file(path)
+      text.scan(/I18n.t\(['"]([\.\w]*)["'].*\)/).map do |match|
+        occurrence = occurrence_from_position(
+          path, text, Regexp.last_match.offset(0).first
+        )
+        [match.first, occurrence]
+      end
+    end
+  end
+end
+
+I18n::Tasks.add_scanner 'I18nTasks::JsErbLocaleMatcher', only: %w[*.js.erb]