Add i18n-tasks with adapted config from CodeHarbor

Gemfile.lock

@@ -184,6 +184,16 @@ GEM
     i18n-js (4.2.3)
       glob (>= 0.4.0)
       i18n
+    i18n-tasks (1.0.14)
+      activesupport (>= 4.0.2)
+      ast (>= 2.1.0)
+      erubi
+      highline (>= 2.0.0)
+      i18n
+      parser (>= 3.2.2.1)
+      rails-i18n
+      rainbow (>= 2.2.2, < 4.0)
+      terminal-table (>= 1.5.1)
     image_processing (1.12.2)
       mini_magick (>= 4.9.5, < 5)
       ruby-vips (>= 2.0.17, < 3)
@@ -524,6 +534,8 @@ GEM
     strscan (3.1.0)
     telegraf (3.0.0)
     temple (0.10.3)
+    terminal-table (3.0.2)
+      unicode-display_width (>= 1.1.1, < 3)
     terser (1.2.2)
       execjs (>= 0.3.0, < 3)
     thor (1.3.1)
@@ -595,6 +607,7 @@ DEPENDENCIES
   highline
   http_accept_language
   i18n-js
+  i18n-tasks
   ims-lti (< 2.0.0)
   jbuilder
   js-routes