Avoid trying to load a module's language file multiple times

[mbabker]

Summary of Changes

Depending on how many times a module gets used on a page, its language files may attempt to be loaded multiple times. Because of the internal loading of the default language, depending on where a language file is located the load method will go through at least a couple of loops resulting in a bunch of extra processing. Example:

By checking if the files have been loaded first, we can cut back on the number of loops that get made here. Example:

### Testing Instructions

The module's language files are still loaded correctly.

Documentation Changes Required

N/A

[andrepereiradasilva]

I have tested this item ✅ successfully on a5ecc9a

works as described

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[Fedik]

I have tested this item ✅ successfully on a5ecc9a

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11698.}

[zero-24]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11698.}

[infograf768]

@mbabker
Regression: seee #11812

[infograf768]

Maybe we need to chnage to
if (!$lang->getPaths($module->module || $app->isAdmin())) ?

[mbabker]

Not an acceptable fix. It basically says "always load language files for an extension on the admin app, regardless of if loaded or not". The whole point of this was to reduce the number of times we're calling JLanguage::load() when an extension has already been loaded.