The type of trader that could be able to handle out this kind of movement or someone who could put up some analysis into this kind of price movement is into those scalpers
but generally speaking about 15 seconds or 30 seconds time frame is really something that no analysis that could really be applied.
With very short time frames, it is like gamble with probability of luckiness.
3. Dark mode?
The site is fancy looking and really love those color combinations but sometimes it does hurt my eye too much.
Not everyone will feel the same like you but have two modes, Light and Dark modes, will be better. It helps the platform to serve users better with customization on website visual mode.
About languages, there is Vietnamese but when I click on it, the language is still English. Is it only your team plan to add that language later?
I don't check other languages.
If you need translation for multiple languages, you can find some translators from
[TRANSLATION SERVICE] WW's SERVICEs - ALL LANGUAGES AVAILABLE