[ci skip] 3.1.5 release

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-##############
-Language Class
-##############
-
-The Language Class provides functions to retrieve language files and
-lines of text for purposes of internationalization.
-
-In your CodeIgniter **system** folder, you will find a **language** sub-directory
-containing a set of language files for the **english** idiom.
-The files in this directory (**system/language/english/**) define the regular messages,
-error messages, and other generally output terms or expressions, for the different parts
-of the CodeIgniter framework.
-
-You can create or incorporate your own language files, as needed, in order to provide
-application-specific error and other messages, or to provide translations of the core
-messages into other languages. These translations or additional messages would go inside
-your **application/language/** directory, with separate sub-directories for each idiom
-(for instance, 'french' or 'german').
-
-The CodeIgniter framework comes with a set of language files for the "english" idiom.
-Additional approved translations for different idioms may be found in the
-`CodeIgniter 3 Translations repositories <https://github.com/bcit-ci/codeigniter3-translations>`_.
-Each repository deals with a single idiom.
-
-When CodeIgniter loads language files, it will load the one in **system/language/**
-first and will then look for an override in your **application/language/** directory.
-
-.. note:: Each language should be stored in its own folder. For example,
-	the English files are located at: system/language/english
-
-.. contents::
-  :local:
-
-.. raw:: html
-
-  <div class="custom-index container"></div>
-
-***************************
-Handling Multiple Languages
-***************************
-
-If you want to support multiple languages in your application, you would provide folders inside
-your **application/language/** directory for each of them, and you would specify the default
-language in your **application/config/config.php**.
-
-The **application/language/english/** directory would contain any additional language files
-needed by your application, for instance for error messages.
-
-Each of the other idiom-specific directories would contain the core language files that you
-obtained from the translations repositories, or that you translated yourself, as well as
-any additional ones needed by your application.
-
-You would store the language you are currently using, for instance in a session variable.
-
-Sample Language Files
-=====================
-
-::
-
-	system/
-		language/
-			english/
-				...
-				email_lang.php
-				form_validation_lang.php
-				...
-
-	application/
-		language/
-			english/
-				error_messages_lang.php
-			french/
-				...
-				email_lang.php
-				error_messages_lang.php
-				form_validation_lang.php
-				...
-
-Example of switching languages
-==============================
-
-::
-
-	$idiom = $this->session->get_userdata('language');
-	$this->lang->load('error_messages', $idiom);
-	$oops = $this->lang->line('message_key');
-
-********************
-Internationalization
-********************
-
-The Language class in CodeIgniter is meant to provide an easy and lightweight
-way to support multiplelanguages in your application. It is not meant to be a
-full implementation of what is commonly called `internationalization and localization
-<http://en.wikipedia.org/wiki/Internationalization_and_localization>`_.
-
-We use the term "idiom" to refer to a language using its common name,
-rather than using any of the international standards, such as "en", "en-US",
-or "en-CA-x-ca" for English and some of its variants.
-
-.. note:: There is nothing to prevent you from using those abbreviations in your application!
-
-************************
-Using the Language Class
-************************
-
-Creating Language Files
-=======================
-
-Language files must be named with **_lang.php** as the filename extension.
-For example, let's say you want to create a file containing error messages.
-You might name it: error_lang.php
-
-Within the file you will assign each line of text to an array called
-``$lang`` with this prototype::
-
-	$lang['language_key'] = 'The actual message to be shown';
-
-.. note:: It's a good practice to use a common prefix for all messages
-	in a given file to avoid collisions with similarly named items in other
-	files. For example, if you are creating error messages you might prefix
-	them with error\_
-
-::
-
-	$lang['error_email_missing'] = 'You must submit an email address';
-	$lang['error_url_missing'] = 'You must submit a URL';
-	$lang['error_username_missing'] = 'You must submit a username';
-
-Loading A Language File
-=======================
-
-In order to fetch a line from a particular file you must load the file
-first. Loading a language file is done with the following code::
-
-	$this->lang->load('filename', 'language');
-
-Where filename is the name of the file you wish to load (without the
-file extension), and language is the language set containing it (ie,
-english). If the second parameter is missing, the default language set
-in your **application/config/config.php** file will be used.
-
-You can also load multiple language files at the same time by passing an array of language files as first parameter.
-::
-
-	$this->lang->load(array('filename1', 'filename2'));
-
-.. note:: The *language* parameter can only consist of letters.
-
-Fetching a Line of Text
-=======================
-
-Once your desired language file is loaded you can access any line of
-text using this function::
-
-	$this->lang->line('language_key');
-
-Where *language_key* is the array key corresponding to the line you wish
-to show.
-
-You can optionally pass FALSE as the second argument of that method to
-disable error logging, in case you're not sure if the line exists::
-
-	$this->lang->line('misc_key', FALSE);
-
-.. note:: This method simply returns the line. It does not echo it.
-
-Using language lines as form labels
------------------------------------
-
-This feature has been deprecated from the language library and moved to
-the :php:func:`lang()` function of the :doc:`Language Helper
-<../helpers/language_helper>`.
-
-Auto-loading Languages
-======================
-
-If you find that you need a particular language globally throughout your
-application, you can tell CodeIgniter to :doc:`auto-load
-<../general/autoloader>` it during system initialization. This is done
-by opening the **application/config/autoload.php** file and adding the
-language(s) to the autoload array.
-
-***************
-Class Reference
-***************
-
-.. php:class:: CI_Lang
-
-	.. php:method:: load($langfile[, $idiom = ''[, $return = FALSE[, $add_suffix = TRUE[, $alt_path = '']]]])
-
-		:param	mixed	$langfile: Language file to load or array with multiple files
-		:param	string	$idiom: Language name (i.e. 'english')
-		:param	bool	$return: Whether to return the loaded array of translations
-		:param	bool	$add_suffix: Whether to add the '_lang' suffix to the language file name
-		:param	string	$alt_path: An alternative path to look in for the language file
-		:returns:	Array of language lines if $return is set to TRUE, otherwise void
-		:rtype:	mixed
-
-		Loads a language file.
-
-	.. php:method:: line($line[, $log_errors = TRUE])
-
-		:param	string	$line: Language line key name
-		:param	bool	$log_errors: Whether to log an error if the line isn't found
-		:returns:	Language line string or FALSE on failure
-		:rtype:	string
-
-		Fetches a single translation line from the already loaded language files,
-		based on the line's name.
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