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A major strength of Joomla! is its built-in multilingual support. Joomla! has special language handling classes that translate strings. The default language is configured in the Language Manager. The language can be overridden by a logged-in user’s preferences.
We use the static JText class to translate text. JText has three methods for translating text: _(), sprintf(), and printf(). The method that we use most is _(). This method is the most basic; it simply translates a string.