You're welcome.
I already help you updated to latest version of Echo template on your site now, and I realised your background get changed, I would suggest you change the cover image from backend > Easysocial > setting > general > login , check my attached screenshot below.
Regarding those language constant, you can double check from this language file
JoomlaFolder/language/en-GB/en-GB.tpl_echo.ini, once you get the language constant for example :
TPL_ECHO_HEADLINES="Join thousands of creative thinkers and makers."
You can override this on Joomla language override section, you can refer on our documentation how to do it.
Documentation link :
https://stackideas.com/docs/easysocial/administrators/languages/creating-language-overrides
So you no need to worry every time you update Echo template for those custom language translation.
Regarding with your dropdown styling, it seems still got some issue, I will report this to our designer regarding this.