Use embed package for translations instead of generated files

Replace "go generate" with the new embed package.

locale/catalog.go

@@ -5,6 +5,7 @@
 package locale // import "miniflux.app/locale"
 
 import (
+	"embed"
 	"encoding/json"
 	"fmt"
 )
@@ -14,23 +15,41 @@ type catalog map[string]translationDict
 
 var defaultCatalog catalog
 
-func init() {
+//go:embed translations/*.json
+var translationFiles embed.FS
+
+// LoadCatalogMessages loads and parses all translations encoded in JSON.
+func LoadCatalogMessages() error {
+	var err error
 	defaultCatalog = make(catalog)
 
-	for language, data := range translations {
-		messages, err := parseTranslationDict(data)
+	for language := range AvailableLanguages() {
+		defaultCatalog[language], err = loadTranslationFile(language)
 		if err != nil {
-			panic(err)
+			return err
 		}
-
-		defaultCatalog[language] = messages
 	}
+	return nil
 }
 
-func parseTranslationDict(data string) (translationDict, error) {
-	var translations translationDict
-	if err := json.Unmarshal([]byte(data), &translations); err != nil {
-		return nil, fmt.Errorf("invalid translation file: %v", err)
+func loadTranslationFile(language string) (translationDict, error) {
+	translationFileData, err := translationFiles.ReadFile(fmt.Sprintf("translations/%s.json", language))
+	if err != nil {
+		return nil, err
 	}
-	return translations, nil
+
+	translationMessages, err := parseTranslationMessages(translationFileData)
+	if err != nil {
+		return nil, err
+	}
+
+	return translationMessages, nil
+}
+
+func parseTranslationMessages(data []byte) (translationDict, error) {
+	var translationMessages translationDict
+	if err := json.Unmarshal(data, &translationMessages); err != nil {
+		return nil, fmt.Errorf(`invalid translation file: %w`, err)
+	}
+	return translationMessages, nil
 }