fix: csvTemplate error

--bug=1052711 --user=王孝刚 【知识库】英文模式-文档-QA问答对-下载的csv模版内容错误 https://www.tapd.cn/57709429/s/1661565

Author: wxg0103

apps/dataset/serializers/document_serializers.py

@@ -248,7 +248,7 @@ def export(self, with_valid=True):
                     "rb")
                 content = file.read()
                 file.close()
-                return HttpResponse(content, status=200, headers={'Content-Type': 'text/cxv',
+                return HttpResponse(content, status=200, headers={'Content-Type': 'text/csv',
                                                                   'Content-Disposition': 'attachment; filename="csv_template.csv"'})
             elif self.data.get('type') == 'excel':
                 file = open(os.path.join(PROJECT_DIR, "apps", "dataset", 'template',

apps/dataset/template/csv_template_en.csv

@@ -1,8 +1,5 @@
-Section title (optional), Section content (required, question answer, no more than 4096 characters)), question (optional, one per line in the cell)
-MaxKB product introduction, "MaxKB is a knowledge base question and answer system based on the LLM large language model. MaxKB = Max Knowledge Base aims to become the most powerful brain of the enterprise.
-Out-of-the-box: Supports direct uploading of documents, automatic crawling of online documents, automatic text splitting and vectorization, and a good intelligent Q&A interactive experience;
-Seamless embedding: Supports rapid embedding into third-party business systems with zero coding;
-Multi-model support: Supports docking with mainstream large models, including Ollama local private large models (such as Llama 2, Llama 3, qwen), Tongyi Qianwen, OpenAI, Azure OpenAI, Kimi, Zhipu AI, iFlytek Spark and Baidu Qianfan Large models etc. ","What is MaxKB?
+Section title (optional), Section content (required，question answer，no more than 4096 characters)), question (optional，one per line in the cell)
+MaxKB product introduction,"MaxKB is a knowledge base question-answering system based on the LLM large language model. MaxKB = Max Knowledge Base，aims to become the most powerful brain of the enterprise。Out-of-the-box: supports direct document upload、automatic crawling of online documents、automatic text splitting and vectorization、and good intelligent question-answering interactive experience；Seamless embedding: supports zero-coding and rapid embedding into third-party business systems；Multi-model support: supports docking with mainstream large models，including Ollama local private large models (such as Llama 2、Llama 3、qwen)、Tongyi Qianwen、OpenAI、Azure OpenAI、Kimi、Zhipu AI、iFlytek Spark and Baidu Qianfan large models、etc.","What is MaxKB?
 MaxKB product introduction
 Large language model supported by MaxKB
 MaxKB advantages"