How to Change Laungage Strings and Make Community URL a Website Main URL

Hi Good Morning Stackideas Support Team How Are you ^_^

1. How can i Change some of Language Strings To Own Custom Language Strings

For Example ,Change Following Words:

"Groups" -----> "Circle"
"Friends" -----> "Connections"
"Events" ------> "Happens"


2. Right Now to ES Community is accessible By Following URL
http://mydomain.com/index.php/community
http://mydomain.com/index.php/community/community-groups/groups

Is any Way it could be Directly accessible by Following URL

http://mydomain.com/index.php/
http://mydomain.com/index.php/community-groups/groups

Just want to remove "/community" from URL

When ever user type main url
mydomain.com
Its show ES Dashboard without /community at end of url
Thanks