i18n: Settings panel — 16 French labels now i18n

Backend config labels: debounce, results/page, min query, search timeout,
  max backups, search workers, max content size, title boost, prefix expansions

Section headers: Backend, Reading & editing, Experience, Access

Misc: Open in new window, project repository, name placeholder

+17 new keys (1241 total)

frontend/locales/en.json

@@ -1234,5 +1234,16 @@
   "about.joke_8": "Technically, everything is an edge case.",
   "about.joke_9": "The CSS for this panel took longer than the backend.",
   "about.tests": "Tests",
-  "about.git": "Git&nbsp;: <strong id=\"about-commit\">—</strong>"
+  "about.git": "Git&nbsp;: <strong id=\"about-commit\">—</strong>",
+  "config.results_per_page": "Results per page",
+  "config.min_query_length": "Min query length",
+  "config.search_timeout": "Search timeout (ms)",
+  "config.max_backups": "Max backups per file",
+  "config.search_workers": "Search workers",
+  "config.max_content_size": "Max content size (bytes)",
+  "config.title_boost": "Title boost",
+  "config.max_prefix_expansions": "Max prefix expansions",
+  "config.open_new_window": "Open in new window",
+  "config.project_repo": "project repository",
+  "config.name_placeholder": "Your name"
 }

frontend/locales/fr.json

@@ -1234,5 +1234,16 @@
   "about.joke_8": "Techniquement, tout est un edge case.",
   "about.joke_9": "Le CSS de ce panneau a pris plus de temps que le backend.",
   "about.tests": "Tests",
-  "about.git": "Git&nbsp;: <strong id=\"about-commit\">—</strong>"
+  "about.git": "Git&nbsp;: <strong id=\"about-commit\">—</strong>",
+  "config.results_per_page": "Résultats par page",
+  "config.min_query_length": "Longueur min. requête",
+  "config.search_timeout": "Timeout recherche (ms)",
+  "config.max_backups": "Max backups par fichier",
+  "config.search_workers": "Workers de recherche",
+  "config.max_content_size": "Taille max contenu (octets)",
+  "config.title_boost": "Boost titre",
+  "config.max_prefix_expansions": "Expansions préfixe max",
+  "config.open_new_window": "Ouvrir dans nouvelle fenêtre",
+  "config.project_repo": "dépôt du projet",
+  "config.name_placeholder": "Votre nom"
 }