i18n: replace hardcoded strings with language translations

批量将项目中多处硬编码的文本替换为多语言翻译条目，统一项目文案管理，提升多语言适配效率，包括导航提示、操作反馈、空状态提示、表单占位符等各类文本内容。

pages_promotion/merch/public/edit.js

@@ -123,14 +123,14 @@ export default {
 		if (this.goodsData.id) {
 			this.isAWait = true;
 			uni.setNavigationBarTitle({
-				title: '编辑商品'
+				title: this.$lang('merch.editGoods')
 			});
 			await this.editGetGoodsInfo();
 		} else {
 			
 			this.isAWait = false;
 			uni.setNavigationBarTitle({
-				title: '添加商品'
+				title: this.$lang('merch.addGoods')
 			});
 		}
 
@@ -167,7 +167,7 @@ export default {
 					if(res.result.detail){
 						this.goodsData = res.result.detail
 						this.$util.showToast({
-							title: '商品不存在',
+							title: this.$lang('merch.goodsNotExist'),
 						});
 						setTimeout(() => {
 							this.$util.redirectTo('/pages_goods/list', {}, 'redirectTo');
@@ -265,7 +265,7 @@ export default {
 				this.$forceUpdate();
 			} else {
 				this.$util.showToast({
-					title: '商品不存在',
+					title: this.$lang('merch.goodsNotExist'),
 				});
 				setTimeout(() => {
 					this.$util.redirectTo('/pages_goods/list', {}, 'redirectTo');
@@ -493,7 +493,7 @@ export default {
 		addShopCategory() {
 			if (this.shopCategoryNumber == 10) {
 				this.$util.showToast({
-					title: '商品可以属于多个分类，最多10个'
+					title: this.$lang('merch.maxCategoryLimit')
 				});
 				return;
 			}
@@ -568,21 +568,21 @@ export default {
 
 			if (this.goodsData.goodsname.length == 0) {
 				this.$util.showToast({
-					title: '请输入商品名称'
+					title: this.$lang('merch.inputGoodsName')
 				});
 				return false;
 			}
 
 			if (this.goodsData.subtitle.length > 100) {
 				this.$util.showToast({
-					title: '商品简介不能超过100个字符'
+					title: this.$lang('merch.subtitleMaxLength')
 				});
 				return false;
 			}
 
 			if (this.goodsData.goods_image.length == 0) {
 				this.$util.showToast({
-					title: '请上传商品图片'
+					title: this.$lang('merch.uploadGoodsImage')
 				});
 				return false;
 			}
@@ -632,7 +632,7 @@ export default {
 				if (this.goodsData.price == 0) {
 					
 					this.$util.showToast({
-						title: '请输入销售价'
+						title: this.$lang('merch.inputPrice')
 					});
 					return false;
 				}
@@ -655,26 +655,26 @@ export default {
 			// 总库存
 			if (this.goodsData.total == 0) {
 				this.$util.showToast({
-					title: '请输入库存'
+					title: this.$lang('merch.inputStock')
 				});
 				return false;
 			}
 
 			if (isNaN(this.goodsData.total) || !this.$util.data().regExp.number.test(this.goodsData.total)) {
 				this.$util.showToast({
-					title: '[库存]格式输入错误'
+					title: this.$lang('merch.stockFormatError')
 				});
 				return false;
 			}
 			if (isNaN(this.goodsData.goods_start_count) || !this.$util.data().regExp.number.test(this.goodsData.goods_start_count)) {
 				this.$util.showToast({
-					title: '[起售]格式输入错误'
+					title: this.$lang('merch.startCountFormatError')
 				});
 				return false;
 			}
 			if (this.goodsData.goods_start_count < 0) {
 				this.$util.showToast({
-					title: '起售数量不能小于0'
+					title: this.$lang('merch.startCountNotNegative')
 				});
 				return false;
 			}