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_tool/order/refund_batch.vue

@@ -40,7 +40,7 @@
 						<textarea
 							v-if="!showText"
 							class="newText"
-							placeholder="请输入退款说明(选填)"
+							:placeholder="$lang('refund.refundRemark')"
 							placeholder-class="color-tip font-size-tag"
 							:auto-height="true"
 							v-model="refund_remark"
@@ -49,7 +49,7 @@
 						<!-- #ifdef H5 -->
 						<textarea
 							class="newText"
-							placeholder="请输入退款说明(选填)"
+							:placeholder="$lang('refund.refundRemark')"
 							@blur="textBlur()"
 							placeholder-class="color-tip font-size-tag"
 							:auto-height="true"
@@ -164,7 +164,7 @@ export default {
 						this.refund_data = res.data;
 						if (this.$refs.loadingCover) this.$refs.loadingCover.hide();
 					} else {
-						this.$util.showToast({ title: '未获取到该订单项退款信息' });
+						this.$util.showToast({ title: this.$lang('refund.noRefundData') });
 						setTimeout(() => {
 							this.$util.redirectTo('/pages_order/list');
 						}, 1000);
@@ -241,7 +241,7 @@ export default {
 		},
 		verify() {
 			if (this.refund_reason == '') {
-				this.$util.showToast({ title: '请选择退款原因' });
+				this.$util.showToast({ title: this.$lang('refund.selectRefundReason') });
 				return false;
 			}
 			return true;