feat: add Catalan strings (#1049)

## Summary

* **What is the goal of this PR?** (e.g., Implements the new feature for
file uploading.)

Add support for Catalan language user interface.
* **What changes are included?**

A new i18n file catalan.yml.

## Additional Context

* Add any other information that might be helpful for the reviewer
(e.g., performance implications, potential risks,
  specific areas to focus on).

---

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Did you use AI tools to help write this code?  NO

lib/I18n/I18nKeys.h

@@ -14,6 +14,7 @@ extern const char* const STRINGS_PO[];
 extern const char* const STRINGS_RU[];
 extern const char* const STRINGS_SV[];
 extern const char* const STRINGS_RO[];
+extern const char* const STRINGS_CA[];
 }  // namespace i18n_strings
 
 // Language enum
@@ -27,6 +28,7 @@ enum class Language : uint8_t {
   RUSSIAN = 6,
   SWEDISH = 7,
   ROMANIAN = 8,
+  CATALAN = 9,
   _COUNT
 };
 
@@ -378,6 +380,8 @@ inline const char* const* getStringArray(Language lang) {
       return i18n_strings::STRINGS_SV;
     case Language::ROMANIAN:
       return i18n_strings::STRINGS_RO;
+    case Language::CATALAN:
+      return i18n_strings::STRINGS_CA;
     default:
       return i18n_strings::STRINGS_EN;
   }