stream settings: Restore original stream name in UI on error.
stream settings: Restore original stream name in UI on error.

Update stream-name-editable span in UI if it throws error
changing stream name.

jackrzhang/zulip,jackrzhang/zulip,tommyip/zulip,zulip/zulip,tommyip/zulip,kou/zulip,rishig/zulip,synicalsyntax/zulip,shubhamdhama/zulip,eeshangarg/zulip,dhcrzf/zulip,timabbott/zulip,zulip/zulip,brainwane/zulip,hackerkid/zulip,kou/zulip,eeshangarg/zulip,synicalsyntax/zulip,tommyip/zulip,jackrzhang/zulip,rishig/zulip,kou/zulip,brainwane/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,andersk/zulip,rishig/zulip,eeshangarg/zulip,andersk/zulip,rishig/zulip,showell/zulip,zulip/zulip,shubhamdhama/zulip,hackerkid/zulip,rht/zulip,andersk/zulip,andersk/zulip,zulip/zulip,dhcrzf/zulip,kou/zulip,hackerkid/zulip,tommyip/zulip,punchagan/zulip,rht/zulip,rishig/zulip,punchagan/zulip,kou/zulip,showell/zulip,brainwane/zulip,timabbott/zulip,jackrzhang/zulip,brainwane/zulip,eeshangarg/zulip,timabbott/zulip,shubhamdhama/zulip,rishig/zulip,dhcrzf/zulip,zulip/zulip,andersk/zulip,timabbott/zulip,showell/zulip,showell/zulip,synicalsyntax/zulip,punchagan/zulip,shubhamdhama/zulip,jackrzhang/zulip,shubhamdhama/zulip,dhcrzf/zulip,punchagan/zulip,rht/zulip,kou/zulip,brainwane/zulip,hackerkid/zulip,timabbott/zulip,timabbott/zulip,showell/zulip,shubhamdhama/zulip,kou/zulip,zulip/zulip,synicalsyntax/zulip,shubhamdhama/zulip,brainwane/zulip,punchagan/zulip,showell/zulip,rht/zulip,hackerkid/zulip,hackerkid/zulip,zulip/zulip,hackerkid/zulip,brainwane/zulip,rht/zulip,timabbott/zulip,rishig/zulip,rht/zulip,synicalsyntax/zulip,jackrzhang/zulip,punchagan/zulip,synicalsyntax/zulip,jackrzhang/zulip,dhcrzf/zulip,punchagan/zulip,synicalsyntax/zulip,rht/zulip,tommyip/zulip,dhcrzf/zulip,dhcrzf/zulip,andersk/zulip,showell/zulip,tommyip/zulip,eeshangarg/zulip,tommyip/zulip