Fixes checkin-checkout behaviour for languages.
Fixes checkin-checkout behaviour in translations.
Fixing checkin error on language save & save-close. Adding language string for COM_LOCALISE_LANGUAGES_N_ITEMS_CHECKED_IN & COM_LOCALISE_TRANSLATIONS_N_ITEMS_CHECKED_IN.
Passing the config param directly in getModel to avoid repopulating of the state.
Merge pull request #212 from Achal-Aggarwal/language-checkin-out

Fixes checkin-checkout behavior for languages, translations.
Using packege & pacjagefile id instead of their name. And fixes the model to use in case of packagefile.
Fixes issues with duplicating, deleting & exporting packages after using package id instead of name in the request.
Fixes checkin-checkout behaviour for packages.