feat: fr, ca, cs locales support (#76)

* refactor(spec): extracted core locales into separate func

* feat(spec): enable `fr`, `ca`, and `cs` in source-only mode

* chore: add changeset

Author: maxprilutskiy

.changeset/early-fireants-share.md

@@ -0,0 +1,5 @@
+---
+"@replexica/spec": minor
+---
+
+enable french, catalan in source/target mode, and czech in source-only mode

packages/spec/src/locales.ts

@@ -1,11 +1,23 @@
 import Z from 'zod';
 
+const coreLocales = [
+  'en', // English
+  'es', // Spanish
+  'fr', // French
+  'ca', // Catalan
+] as const;
+
 // Source
-export const sourceLocales = ['en'] as const;
+export const sourceLocales = [
+  ...coreLocales,
+  'cs', // Czech
+] as const;
 
 export const sourceLocaleSchema = Z.enum(sourceLocales);
 
 // Target
-export const targetLocales = ['es'] as const;
+export const targetLocales = [
+  ...coreLocales,
+] as const;
 
 export const targetLocaleSchema = Z.enum(targetLocales);