Update zh-CN (Simplified Chinese) translation

[ykla]

Update zh-CN (Simplified Chinese) translation.

• The Simplified Chinese translation of Raspberry Pi Imager has been revised to more closely align with the original text.
• Any entries that were not present in the original text have been removed, and any entries that were not translated have been updated.
• The translation has been subjected to rigorous accuracy checks to ensure optimal alignment with the target audience of Raspberry Pi.
• The terminology employed in reference to Apple macOS has been aligned with the Simplified Chinese translations utilized within the macOS system itself.
• Added translation for Linux desktop icon file

Note: I am unfamiliar with the programming environment on macOS and the process of modifying Info.plist.in. Therefore, I request that someone with the requisite expertise perform these modifications in the future. I am not familiar with Windows at all rpi-imager.rc or rpi-imager.nsi.in. Sorry.

[tdewey-rpi]

@YuzukiTsuru As the last substantial editor of the zh-CN translations, do you have an opinion on this change?

If I receive no feedback within a week, I will use machine translation to verify with a view to merging.

[tdewey-rpi]

Thanks for your thoroughness, @ykla.

As I've had no feedback from the previous translator, I will proceed with a view to accepting this change. As I'm not proficient in the language, this will involve a review with machine translation.

I'll investigate the changes for macOS, but the Windows installer may lag behind until someone with experience of localising such things volunteers their time.

[tdewey-rpi]

Outstanding contribution, @ykla, and very much appreciated. I particularly applaud your attention to the untranslated new strings, and to maintaining the tone of the tool.