* feat(translator): add ChatGPT
* feat: check chatgpt error
* refactor: change chatgpt apiKey not set text
* refactor: change language to google
* docs: yaml indent with 4
* refactor: APIKey in struct
GetSrcLang, GetDstLang, SetSrcLang, SetDstLang, SwapLang are reusable
functions from translator to translator. So make Language struct.
GetEngineName is also a reusable function. So make EngineName struct.
Finally, let Translator to inherit those functions in these three
(Language, TTSLock, EngineName) structs. No need to write the duplicated
functions for each Translator.
- rename function `translatePageHandler` to `translateWindow`
- reorder function call in `ui.go`, let function call jointed
- change the position of comment