Update fr.json5 - 'Parcourir DSpace' and 'Rechercher un(e) collection'

[alphapetjg]

Description

Corrected translations: 'Tout DSpace' to 'Parcourir DSpace' (more accurate with the intended meaning) and adjusted translation for 'Rechercher une collection' to 'Rechercher un(e) collection' (ensures grammatical correctness).

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[pilasou]

I think it is better to leave the submission.sections.general.search-collection as-is. Collection in french is always feminine. The other change is correct. Thanks!

[pilasou]

As this label applies only to Collection, it is better to simply use "une" as "collection" in french is always feminine.

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