add language menu item to tui configuration

internal/tui/configure_language.go

@@ -0,0 +1,11 @@
+package tui
+
+import (
+	"github.com/leonardotrapani/hyprvoice/internal/config"
+)
+
+// editLanguage allows the user to select the global transcription language
+func editLanguage(cfg *config.Config) error {
+	// implementation in task 5
+	return nil
+}