Adding Traditional Chinese translation

Based on the Simplified Chinese translation converted the text, as well as changed a few expressions that are different, and fixed a few typos left over in the Simplified Chinese version.

Should be good basis for using it already, and further refining it later (e.g. with crowdin.net, like it shows in some of the other translation files).

Added this because we are promoting more Bitcoin usage here in Taiwan, and would want to recommend Mycelium as  "my first mobile wallet" for people. English is still not a widely used, and a localized version would be more appealing.

Not sure if any other files are needed to be changed, I can update this pull request if needed.