Missing sharedassets0.assets file in language patch does not terminate install

Currently, if a matching `sharedassets0.assets` file is not found in the language patch, the installer will just hope for the best and use the default one.

It may be a better idea to stop the install with an error if this happens.

I think the way it works currently is that we extract the whole language patch archive directly, which automatically overwrites the sharedassets0.assets. But it may be better to leave the install as-is, without the language patch installed, if we know for sure it won't work.

----

Also see #192 if this is still to be treated as a warning, not an error

尋找提取語言修補程式存檔並處理 sharedassets0.assets 檔案的程式碼。安裝程式很可能有一個檢查此檔案的函式；修改它，使其在檔案缺失時引發錯誤或停止安裝。查看相關 issue #192 以了解警告與錯誤的背景資訊。透過模擬缺少 sharedassets0.assets 檔案的语言修補程式進行測試。

由索引模型根據 Issue 內容生成。