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This filter hook is applied to the translated text by the internationalization functions (__(), _e(), etc.).

IMPORTANT: This filter is always applied even if internationalization is not in effect, and if the text domain has not been loaded. If there are functions hooked to this filter, they will always run. This could lead to a performance problem.

For singular/plural aware translation functions such as _n(), see ngettext().

For context-specific translation functions such as _x(), see filter hook gettext_with_context() and ngettext_with_context().