Refactor error system (#33771)

It should not expose `util.SilentWrap` or construct it manually.

modules/translation/i18n/errors.go

@@ -1,13 +0,0 @@
-// Copyright 2022 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package i18n
-
-import (
-	"code.gitea.io/gitea/modules/util"
-)
-
-var (
-	ErrLocaleAlreadyExist = util.SilentWrap{Message: "lang already exists", Err: util.ErrAlreadyExist}
-	ErrUncertainArguments = util.SilentWrap{Message: "arguments to i18n should not contain uncertain slices", Err: util.ErrInvalidArgument}
-)

modules/translation/i18n/format.go

@@ -4,6 +4,7 @@
 package i18n
 
 import (
+	"errors"
 	"fmt"
 	"reflect"
 )
@@ -30,7 +31,7 @@ func Format(format string, args ...any) (msg string, err error) {
 					fmtArgs = append(fmtArgs, val.Index(i).Interface())
 				}
 			} else {
-				err = ErrUncertainArguments
+				err = errors.New("arguments to i18n should not contain uncertain slices")
 				break
 			}
 		} else {

modules/translation/i18n/localestore.go

@@ -4,6 +4,7 @@
 package i18n
 
 import (
+	"errors"
 	"fmt"
 	"html/template"
 	"slices"
@@ -41,7 +42,7 @@ func NewLocaleStore() LocaleStore {
 // AddLocaleByIni adds locale by ini into the store
 func (store *localeStore) AddLocaleByIni(langName, langDesc string, source, moreSource []byte) error {
 	if _, ok := store.localeMap[langName]; ok {
-		return ErrLocaleAlreadyExist
+		return errors.New("lang has already been added")
 	}
 
 	store.langNames = append(store.langNames, langName)