Add French localization and catch up nb/sv/da/de translations

French (fr) added as a 5th supported language; full catalog translated.
Also caught up nb/sv/da/de for ~300 strings added since the last
localization pass (Jarvis, Anytype, model categories, reasoning effort,
Combine Conversations) plus Button/Toggle/Menu/CommandMenu titles and
custom sectionHeader/row helpers in Settings that were never extracted
by prior tooling, leaving Settings and the View menu English-only
regardless of locale.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

oAI.xcodeproj/project.pbxproj

@@ -104,6 +104,7 @@
 				da,
 				de,
 				sv,
+				fr,
 			);
 			mainGroup = A550A6592F3B72EA00136F2B;
 			minimizedProjectReferenceProxies = 1;