Doc: Update translations of admin guide
Doc: Update translations of API reference
Doc: Update translations for plugin reference
Merge pull request #76 from maskit/translate/update_admin

Doc: Update translations of admin guide
Merge pull request #77 from maskit/translate/update_ref_api

Doc: Update translations of API reference
Merge pull request #78 from maskit/translate/update_ref_plugins

Doc: Update translations for plugin reference