add finnish translation

add finnish translation

config/application.rb

@@ -24,7 +24,7 @@ module Mastodon
 
     # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
     # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
-    config.i18n.available_locales = [:en, :de, :es, :pt, :fr, :hu, :uk, 'zh-CN']
+    config.i18n.available_locales = [:en, :de, :es, :pt, :fr, :hu, :uk, 'zh-CN', :fi]
     config.i18n.default_locale    = :en
 
     # config.paths.add File.join('app', 'api'), glob: File.join('**', '*.rb')