Use language detection to streamline translation process

[kangsuhyun-yanolja]

Our current translation category requires users to manually select the source language, a step that could lead to inaccuracies if the wrong language is chosen. Additionally, this process necessitates users making two choices (source and target language), which can slightly complicate the user experience. Automating the detection of the source language would simplify the translation process, reducing it to a single decision for the user: choosing the target language.

[kimsooyeon-yanolja]

@kangsuhyun-yanolja
when utilizing "Any" part of below PR#82, the process seems likely to be naturally streamlined.

[kimsooyeon-yanolja]

Then, how about add a new button to switch between the source and the target language?
it's basic function used in existing translation services
while not the fundamental feature of Arena, adding this is expected to increase user's convenience.

[kangsuhyun-yanolja]

@kimsooyeon-yanolja That would be better 👍