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TUTORIAL #01 - Drupal Multilingual (i18n) Basic Configuration
This is a basic tutorial for Drupal Multilingual (i18n). I've used only the necessary modules for a starting demo. Actually Drupal Multilingual (i18n) is a quite complex Drupal area where many related modules have their specific role aimed to expand its functionality and there are also many configuration options to meet user specific needs and requirements. 
Core:
drupal-7.50.tar
Required modules:
i18n-7.x-1.13.tar >>> https://www.drupal.org/project/i18n
variable-7.x-2.5.tar >>> https://www.drupal.org/project/variable
  1. Activate the module > "Internationalization" and > "Multilingual content" in > "admin/modules", this message will appear > "(You must enable the Content translation, Locale, Variable, String translation modules to install Multilingual content. Would you like to continue with the above?)" and Click > "Continue".
  2. Download a file to add the desired language > "https://localize.drupal.org/download" es. (Italian - 7.50 (675.04 KB)) > "drupal-7.50.it.po".
  3. Import the language file you just downloaded. Go to > "admin/config/regional/translate/import", under "Import translation" Click > "Browse", select > "drupal-7.50.it.po", from Drop Down menu select > "Italian (Italiano)" and Click > "Import" at the bottom of the screen.
  4. Go to > "admin/config/regional/language/configure", under > "User interface text language detection" put the flag on > "URL" and Click > "Save settings" at the bottom of the screen.
  5. Go to > "admin/config/regional/language/edit/en", under > "Path prefix language code" (Text Area) put "en" prefix (without "") and Click > "Save language" at the bottom of the screen.
  6. As an example let's enable multilanguage in CType > "page" to > "admin/structure/types".
  7. Click on > "edit" on the right of CType > "Basic page (Machine name: page)", select the TAB > "Publishing options", under > "Multilingual support" select > "Enabled, with translation" and click > "Save content type" at the bottom of the screen.
  8. Click again on > "edit" on the right of CType > "Basic page (Machine name: page)", select the TAB > "Multilingual setting", under the > "Extended language options" flag the following three options > "Set current language as default for new content. | Require language (Do not allow Language Neutral). | Lock language (that cannot be changed).", keep the default selection below > "Extended language support" > "Normal - All enabled languages will be allowed." and click > "Save content type" at the bottom of the screen.
  9. Insert the first multilingual node > "node/add", choose > "Basic page", compile the Title and Body and Click on > "Save" at the bottom of the screen.
  10. After saving the node we shall see a new TAB (to right of TABs > "View and Edit") > "Translate", Click on TAB > "Translate", Click on > "add translation", modify the Title and Body in the Italian language and Click on > "Save" at the bottom of the screen.
  11. Now if we go > "admin/content" we will see two nodes (node/1 and node/2) in 2 languages (en and it).
 

spencer