feat(pages): add multi-language support for landing pages

Implement internationalization system for landing pages:
- Database model for storing language-specific translations
- Language configuration with default and enabled languages
- Language switcher in navigation across all templates
- Translation management UI in settings
- Support for 15 languages including English, Spanish, German, French, Japanese, Chinese
- Auto-detection and manual language selection
- AI-powered translation generation capability

models/migrations/migrations.go

@@ -441,6 +441,7 @@ func prepareMigrationTasks() []*migration {
 		newMigration(364, "Add view_count to blog_post", v1_26.AddViewCountToBlogPost),
 		newMigration(365, "Add public_app_integration to repository", v1_26.AddPublicAppIntegrationToRepository),
 		newMigration(366, "Add page experiment tables for A/B testing", v1_26.AddPageExperimentTables),
+		newMigration(367, "Add pages translation table for multi-language support", v1_26.AddPagesTranslationTable),
 	}
 	return preparedMigrations
 }

models/migrations/v1_26/v367.go

@@ -0,0 +1,24 @@
+// Copyright 2026 MarketAlly. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_26
+
+import (
+	"code.gitcaddy.com/server/v3/modules/timeutil"
+
+	"xorm.io/xorm"
+)
+
+func AddPagesTranslationTable(x *xorm.Engine) error {
+	type Translation struct {
+		ID            int64              `xorm:"pk autoincr"`
+		RepoID        int64              `xorm:"INDEX NOT NULL"`
+		Lang          string             `xorm:"VARCHAR(10) NOT NULL"`
+		ConfigJSON    string             `xorm:"TEXT"`
+		AutoGenerated bool               `xorm:"NOT NULL DEFAULT false"`
+		CreatedUnix   timeutil.TimeStamp `xorm:"created"`
+		UpdatedUnix   timeutil.TimeStamp `xorm:"updated"`
+	}
+
+	return x.Sync(new(Translation))
+}

models/pages/translation.go

@@ -0,0 +1,70 @@
+// Copyright 2026 MarketAlly. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package pages
+
+import (
+	"context"
+
+	"code.gitcaddy.com/server/v3/models/db"
+	"code.gitcaddy.com/server/v3/modules/timeutil"
+)
+
+func init() {
+	db.RegisterModel(new(Translation))
+}
+
+// Translation stores a language-specific translation overlay for a landing page.
+type Translation struct {
+	ID            int64              `xorm:"pk autoincr"`
+	RepoID        int64              `xorm:"INDEX NOT NULL"`
+	Lang          string             `xorm:"VARCHAR(10) NOT NULL"`
+	ConfigJSON    string             `xorm:"TEXT"`
+	AutoGenerated bool               `xorm:"NOT NULL DEFAULT false"`
+	CreatedUnix   timeutil.TimeStamp `xorm:"created"`
+	UpdatedUnix   timeutil.TimeStamp `xorm:"updated"`
+}
+
+// TableName returns the table name for Translation.
+func (t *Translation) TableName() string {
+	return "pages_translation"
+}
+
+// GetTranslationsByRepoID returns all translations for a repository.
+func GetTranslationsByRepoID(ctx context.Context, repoID int64) ([]*Translation, error) {
+	translations := make([]*Translation, 0, 10)
+	return translations, db.GetEngine(ctx).Where("repo_id = ?", repoID).
+		Asc("lang").Find(&translations)
+}
+
+// GetTranslation returns a specific language translation for a repository.
+func GetTranslation(ctx context.Context, repoID int64, lang string) (*Translation, error) {
+	t := new(Translation)
+	has, err := db.GetEngine(ctx).Where("repo_id = ? AND lang = ?", repoID, lang).Get(t)
+	if err != nil {
+		return nil, err
+	}
+	if !has {
+		return nil, nil
+	}
+	return t, nil
+}
+
+// CreateTranslation creates a new translation.
+func CreateTranslation(ctx context.Context, t *Translation) error {
+	_, err := db.GetEngine(ctx).Insert(t)
+	return err
+}
+
+// UpdateTranslation updates an existing translation.
+func UpdateTranslation(ctx context.Context, t *Translation) error {
+	_, err := db.GetEngine(ctx).ID(t.ID).Cols("config_json", "auto_generated").Update(t)
+	return err
+}
+
+// DeleteTranslation deletes a translation by repo ID and language.
+func DeleteTranslation(ctx context.Context, repoID int64, lang string) error {
+	_, err := db.GetEngine(ctx).Where("repo_id = ? AND lang = ?", repoID, lang).
+		Delete(new(Translation))
+	return err
+}