residuary = property that belonged to either spouse before and on the date of the marriage

residuary - pertaining to or of the nature of a residue, remainder, or residuum.

commune, from communité de biens. Some translators seem to loke "community" but it's about the couple jointly owning things, not the whole community

qualification = classification

Have already posted Article 1405 of the French Civil Code. The online translation into English is of appalling quality, but here it is fwiw:

Art. 1405
Remain separate property the items of property of which the spouses had ownership or possession on the day of the celebration of the marriage, or which they acquire, during the marriage, through succession, gift or legacy.
A gratuitous transfer may stipulate that the property which is its subject-matter will belong to the community.
Property falls into community, unless otherwise stipulated, where a gratuitous transfer is made jointly to both spouses.
Property surrendered or transferred by the father, mother or other ascendant to one of the spouses, either in order to discharge what he owes to him or her, or under the obligation of paying debts of the donor to outsiders, remain
separate property, subject to reimbursement.

Here is a rather more intelligible interpretation, albeit the writer uses (ugh) "community":

1. Assets personal due to their origin are the assets present at the time of the coming into existence of the community, as well as assets acquired through succession, gift or legacy (Art. 1405 French Civil Code).
Art. 1405 states that the assets of which the spouses had ownership or possession on the day of the celebration of the marriage remain personal; however, the correct phrasing should be:
at the time of the coming into existence of the community. Regardless, this time limit implies that difficulties may arise if the date of the purchase is not certain, e.g. in case of acquisitive prescription or if the acquisition was the result of the exercise of an option during the existence of the community of an unilateral undertaking to sell prior to the community. In case of an acquisitive prescription that was started before the beginning of the community, the asset is personal (what counts is the fact that the spouse had the possession). In case of the
exercise of an option, the asset falls into the community. Indeed, the title of acquisition is the exercise of the option and not the undertaking.71 If the promise of sale was reciprocal, the asset is personal. Indeed, according to Art. 1589 French Civil Code, the reciprocal promise of sale is the same as sale.
Assets acquired through succession, gift or legacy are also personal, unless stated otherwise.
As expressly stated in Art. 1404 sub. 2 French Civil Code, assets fall into the community where a gratuitous transfer is made jointly to both spouses.
2. Assets personal by nature are assets with a personal character and instruments necessary to the profession of one of the spouse (Art. 1404 French Civil Code).