✨ Improve French translation strings.

See https://unicode-table.com/en/202F/ for the character to add before `!`, `?`, `;`, `:` and `»`, and after `«`.

fix: Typography

Replace `...` with `…` for all languages.

In French:

- Replace `'` (quote) with `’` (apostrophe).
- Replace `“` and ” with `«` and `»`.
- Replace `-` (hyphens) with `‑` (non‑breaking hyphens).
- Fix a few grammar issues.
- Replace `Editer` with `Modifier`.
- Replace `Espacement des lettres` with `Crénage`; shorter term for “kerning”.
- Add accents on uppercase letters.

Fix a string in French.

Missed two replacements in French.

Add missing changes:

- French typographic quotes.
- Crénage

Addresses https://github.com/penpot/penpot/pull/591#pullrequestreview-585038080

Update locales:

- Fix some typos in English (dowload, reasign).

- Fix some grammar.
- _Accord de proximité_ on one occasion. (masculine + feminine + adjective = feminine adjective).
- “Soulignage” and “Barré” (I looked at LibreOffice to see how they were doing it).
- Consistent use of “Êtes‑vous sûr de vouloir ”.
- bibliothèque partagée: Bibliothèque Partagée.
- « Mise à jour » to use a noun that is not gender ambiguous.
- “Disposition” changed to “Mise en page” (could be “Composition”, although more ambiguous with other terms).
- Hauteur de ligne: Interlignage.
- Crénage: [Interlettrage](https://fr.wikipedia.org/wiki/Interlettre) which is more what a typographer would do based on the existing kerning of the font.
- Première lettre en majuscule: Premières Lettres en [Capitales](https://fr.wikipedia.org/wiki/Capitale_et_majuscule) (to illustrate the result).
- Quitter: Se déconnecter (clearer about the outcome of the action).
- Use of “a” for the title and “the” for the confirmation.
- Couche: Calque.

Update a missed string for consistency.

[L10N] Update some French terms.

CHANGES.md

@@ -21,6 +21,7 @@
 - Properly handle errors on github, gitlab and ldap auth backends.
 - Properly mark profile auth backend (on first register/ auth with 3rd party auth provider).
 - Fix corner cases on invitation/signup flows.
+- Add more improvements to french translation strings.
 
 
 ## 1.2.0-alpha