[i18n] Update missing string for Occitan (#2141)

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* [i18n] Update missing string for Occitan

According to I18n standardization #2138 this string was missing.
Took the most used translation for "to clear" from Firefox, escafar.
And «cache» like in French and English.
Tell me know if other strings are missing

* Removal of the comment

Comment removed - comentari tirat - commentaire retiré

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