Add zh-tw Locale File for Traditional Chinese Translation

Hi there,

I'm a native Traditional Chinese speaker interested in contributing to the Nettacker project. As a first-time contributor, I've started looking into the localization files and noticed that there is no zh-tw.yaml locale file in the nettacker/locale directory. I want to contribute by providing a Traditional Chinese translation.

However, I observed a discrepancy in the number of lines between the existing locale files:

• en.yaml contains 127 lines
• zh-cn.yaml contains 194 lines

Could someone please clarify which file should be used as the base for the zh-tw.yaml translation? Should I align with the content of en.yaml or follow the more extensive zh-cn.yaml version?

Thank you for your guidance, and I'm excited to contribute!

Compare nettacker/locale/en.yaml with nettacker/locale/zh-cn.yaml first, focusing on their translation keys rather than line counts. Confirm which file reflects the current locale structure with the maintainers, then add the corresponding Traditional Chinese locale as nettacker/locale/zh-tw.yaml. Done means the file covers the agreed key set and follows the existing locale format.