css: Use SCSS nesting in zulip.scss for `.message_sender`.
css: Use SCSS nesting in zulip.scss for `.message_sender`.


hackerkid/zulip,rht/zulip,synicalsyntax/zulip,zulip/zulip,timabbott/zulip,punchagan/zulip,synicalsyntax/zulip,brainwane/zulip,showell/zulip,rht/zulip,punchagan/zulip,brainwane/zulip,andersk/zulip,rht/zulip,kou/zulip,hackerkid/zulip,showell/zulip,kou/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,brainwane/zulip,punchagan/zulip,synicalsyntax/zulip,rht/zulip,zulip/zulip,kou/zulip,synicalsyntax/zulip,showell/zulip,timabbott/zulip,shubhamdhama/zulip,synicalsyntax/zulip,andersk/zulip,brainwane/zulip,andersk/zulip,timabbott/zulip,hackerkid/zulip,showell/zulip,timabbott/zulip,zulip/zulip,hackerkid/zulip,kou/zulip,shubhamdhama/zulip,shubhamdhama/zulip,brainwane/zulip,hackerkid/zulip,zulip/zulip,kou/zulip,timabbott/zulip,timabbott/zulip,hackerkid/zulip,showell/zulip,shubhamdhama/zulip,zulip/zulip,punchagan/zulip,timabbott/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,punchagan/zulip,zulip/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,shubhamdhama/zulip,shubhamdhama/zulip,shubhamdhama/zulip,eeshangarg/zulip,brainwane/zulip,punchagan/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,showell/zulip,andersk/zulip,brainwane/zulip,showell/zulip,zulip/zulip,rht/zulip,punchagan/zulip,hackerkid/zulip,synicalsyntax/zulip,synicalsyntax/zulip