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This tutorial is part of the Developing a Model-View-Controller (MVC) Component for Joomla!2.5 tutorial. You are encouraged to read the previous parts of the tutorial before reading this.
Joomla!2.5 manages languages for components in four different situations:
Joomla!2.5 uses two different location folder for languages:
It depends how the component is installed.
With your favorite file manager and editor, put a file site/language/en-GB/en-GB.com_helloworld.ini. This file will contain translation for the public part. For the moment, this file is empty
For the moment, there are no translations strings in this file.
With your favorite file manager and editor, put a file admin/language/en-GB/en-GB.com_helloworld.ini. This file will contain translation for the backend part.
COM_HELLOWORLD_HELLOWORLD_FIELD_GREETING_DESC="This message will be displayed" COM_HELLOWORLD_HELLOWORLD_FIELD_GREETING_LABEL="Message" COM_HELLOWORLD_HELLOWORLD_HEADING_GREETING="Greeting" COM_HELLOWORLD_HELLOWORLD_HEADING_ID="Id"
With your favorite file manager and editor, put a file admin/language/en-GB/en-GB.com_helloworld.sys.ini. This file will contain translation for the backend part.
COM_HELLOWORLD="Hello World!" COM_HELLOWORLD_DESCRIPTION="This is the Hello World description" COM_HELLOWORLD_HELLOWORLD_VIEW_DEFAULT_TITLE="Hello World" COM_HELLOWORLD_HELLOWORLD_VIEW_DEFAULT_DESC="This view displays a selected message" COM_HELLOWORLD_MENU="Hello World!"
Starting with version 1.7 there are 2 ways to install language files for an extension. One can use one or the other or a combination of both.
The 1.5 way will install the files in the CORE language folders (ROOT/administrator/language/ and ROOT/language/ ). The new way —since 1.6— includes the files in a "language" folder installed at the root of the extension.
Therefore an extension can include a language folder with a .sys.ini different from the one installed in joomla core language folders (this last one not being included in that language folder but in root or any other folder not installed). This let's display 2 different descriptions: one from the sys.ini in the "language" folder is used as a message displayed when install has been done, the other (from the .ini) is used for "normal" operation, i.e. when the extension is edited in back-end. This can be extremely useful when installing also uses some scripts and requires a different value for the description.
Note: The sys.ini file is also used to translate the name of the extensions in some back-end Managers and to provide menu translation for components
Therefore, the xml would include since 1.6
<files> <[...] <folder>language</folder> // This folder HAS to include the right subfolders, i.e. language/en-GB/ ... language/fr-FR/ <filename>whatever</filename> [...] </files>
and/or then (1.5 way):
<languages folder="joomlacorelanguagefolders"> // if using another language folder for cleanliness (any folder name will fit) <language tag="en-GB">en-GB/en-GB.whatever.ini</language> // or <language tag="en-GB">en-GB.whatever.ini</language> if no tagged subfolder <language tag="en-GB">en-GB/en-GB.whatever.sys.ini</language> // or <language tag="en-GB">en-GB.whatever.sys.ini</language> if no tagged subfolder </languages>
or simply in ROOT
<languages> <language tag="en-GB">en-GB.whatever.ini</language> <language tag="en-GB">en-GB.whatever.sys.ini</language> </languages>
Language file used by the install script during install of a component(the first install not upgrade) obeys specific rules described at http://docs.joomla.org/Specification_of_language_files. During the first install, only the language file included in the component folder (/administrator/components/com_helloworld/language) is used when present. If this file is only provided in the CORE language folder (/administrator/language), no translation occurs. This also applies to KEYs used in the manifest file.
When upgrading or uninstalling the extension (not installing), it is the sys.ini file present in the extension root language folder which will display the result of the install from the description key/value. Thereafter, if present, the sys.ini as well as the ini installed in CORE language folder will have priority over the files present in the root language folder of the extension.
Note: One advantage of installing the files in the extension "language" folder is that these are not touched when updating a language pack. The other advantage is that this folder can include multiple languages (en-GB always, fr-FR, it-IT, etc.) not requiring the user to install the corresponding language pack. This is handy as they are available if, later on, a user installs the corresponding pack.
See: Language File Location Options
With your favorite file manager and editor, put a file EXTENSIONROOT/language/en-GB/en-GB.myextension.sys.ini. This file will contain translation for the install.
COM_HELLOWORLD="Hello World!" COM_HELLOWORLD_DESCRIPTION="This is the Hello World description"
The COM_HELLOWORLD_DESCRIPTION can be used in the helloworld.xml file
Content of your code directory
Create a compressed file of this directory or directly download the archive and install it using the extension manager of Joomla. You can add a menu item of this component using the menu manager in the backend.
<?xml version="1.0" encoding="utf-8"?> <extension type="component" version="2.5.0" method="upgrade"> <name>COM_HELLOWORLD</name> <!-- The following elements are optional and free of formatting constraints --> <creationDate>November 2009</creationDate> <author>John Doe</author> <authorEmail>firstname.lastname@example.org</authorEmail> <authorUrl>http://www.example.org</authorUrl> <copyright>Copyright Info</copyright> <license>License Info</license> <!-- The version string is recorded in the components table --> <version>0.0.8</version> <!-- The description is optional and defaults to the name --> <description>COM_HELLOWORLD_DESCRIPTION</description> <install> <!-- Runs on install --> <sql> <file driver="mysql" charset="utf8">sql/install.mysql.utf8.sql</file> </sql> </install> <uninstall> <!-- Runs on uninstall --> <sql> <file driver="mysql" charset="utf8">sql/uninstall.mysql.utf8.sql</file> </sql> </uninstall> <update> <!-- Runs on update; New in 2.5 --> <schemas> <schemapath type="mysql">sql/updates/mysql</schemapath> </schemas> </update> <!-- Site Main File Copy Section --> <!-- Note the folder attribute: This attribute describes the folder to copy FROM in the package to install therefore files copied in this section are copied from /site/ in the package --> <files folder="site"> <filename>index.html</filename> <filename>helloworld.php</filename> <filename>controller.php</filename> <folder>views</folder> <folder>models</folder> <folder>language</folder> </files> <administration> <!-- Administration Menu Section --> <menu>COM_HELLOWORLD_MENU</menu> <!-- Administration Main File Copy Section --> <!-- Note the folder attribute: This attribute describes the folder to copy FROM in the package to install therefore files copied in this section are copied from /admin/ in the package --> <files folder="admin"> <!-- Admin Main File Copy Section --> <filename>index.html</filename> <filename>helloworld.php</filename> <filename>controller.php</filename> <!-- SQL files section --> <folder>sql</folder> <!-- tables files section --> <folder>tables</folder> <!-- models files section --> <folder>models</folder> <!-- views files section --> <folder>views</folder> </files> <languages folder="admin"> <language tag="en-GB">language/en-GB/en-GB.com_helloworld.ini</language> <language tag="en-GB">language/en-GB/en-GB.com_helloworld.sys.ini</language> </languages> </administration> </extension>
In this helloworld.xml file, languages are installed in:
The corrected zip file, download and delete the .png extension before use: 
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