Use embed package for translations instead of generated files

Replace "go generate" with the new embed package.

locale/catalog_test.go

@@ -7,14 +7,14 @@ package locale // import "miniflux.app/locale"
 import "testing"
 
 func TestParserWithInvalidData(t *testing.T) {
-	_, err := parseTranslationDict(`{`)
+	_, err := parseTranslationMessages([]byte(`{`))
 	if err == nil {
 		t.Fatal(`An error should be returned when parsing invalid data`)
 	}
 }
 
 func TestParser(t *testing.T) {
-	translations, err := parseTranslationDict(`{"k": "v"}`)
+	translations, err := parseTranslationMessages([]byte(`{"k": "v"}`))
 	if err != nil {
 		t.Fatalf(`Unexpected parsing error: %v`, err)
 	}
@@ -32,3 +32,60 @@ func TestParser(t *testing.T) {
 		t.Fatal(`The translation key should contains the defined value`)
 	}
 }
+
+func TestLoadCatalog(t *testing.T) {
+	if err := LoadCatalogMessages(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestAllKeysHaveValue(t *testing.T) {
+	for language := range AvailableLanguages() {
+		messages, err := loadTranslationFile(language)
+		if err != nil {
+			t.Fatalf(`Unable to load translation messages for language %q`, language)
+		}
+
+		if len(messages) == 0 {
+			t.Fatalf(`The language %q doesn't have any messages`, language)
+		}
+
+		for k, v := range messages {
+			switch value := v.(type) {
+			case string:
+				if value == "" {
+					t.Errorf(`The key %q for the language %q have an empty string as value`, k, language)
+				}
+			case []string:
+				if len(value) == 0 {
+					t.Errorf(`The key %q for the language %q have an empty list as value`, k, language)
+				}
+			}
+		}
+	}
+}
+
+func TestMissingTranslations(t *testing.T) {
+	refLang := "en_US"
+	references, err := loadTranslationFile(refLang)
+	if err != nil {
+		t.Fatal(`Unable to parse reference language`)
+	}
+
+	for language := range AvailableLanguages() {
+		if language == refLang {
+			continue
+		}
+
+		messages, err := loadTranslationFile(language)
+		if err != nil {
+			t.Fatalf(`Parsing error for language %q`, language)
+		}
+
+		for key := range references {
+			if _, found := messages[key]; !found {
+				t.Fatalf(`Translation key %q not found in language %q`, key, language)
+			}
+		}
+	}
+}