Synced i18n Translation Template and Improved Simplified Chinese Translation

[jeremisty99]

Introduction

In the latest version, it was observed that the translation template had significant discrepancies with the actual displayed content in the program, leading to some texts not being accurately rendered. To address this issue, I reviewed the translation template and eliminated the parts that did not match the current latest version.

Changes

1. Synchronized the translation template with the actual text content in the latest version, eliminating any discrepancies.
2. Enhanced the Simplified Chinese translation to ensure the accuracy and clarity of the translated content.
3. Modified several instances of text in the program app.py that were not internationalized using self.tr() for localization processing.