Fix：Optimize Agent template page, fix bugs in knowledge base (#9009)

### What problem does this PR solve?

Replace Avatar with RAGFlowAvatar component for knowledge base and
agent, optimize Agent template page, and modify bugs in knowledge base
#3221

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/locales/en.ts

@@ -1296,6 +1296,7 @@ This delimiter is used to split the input text into several text pieces echo of
       agentDescription:
         'Builds agent components equipped with reasoning, tool usage, and multi-agent collaboration. ',
       maxRecords: 'Max records',
+      createAgent: 'Create Agent',
       stringTransform: 'String transform',
       userFillUp: 'Input',
       codeExec: 'Code',

web/src/locales/zh.ts

@@ -1248,6 +1248,7 @@ General：实体和关系提取提示来自 GitHub - microsoft/graphrag：基于
       agent: 'Agent',
       agentDescription: '构建具备推理、工具调用和多智能体协同的智能体组件。',
       maxRecords: '最大记录数',
+      createAgent: 'Create Agent',
       stringTransform: '文本处理',
       userFillUp: '等待输入',
       codeExec: '代码',