settings: Include settings label as context to template.
settings: Include settings label as context to template.

This is a preliminary commit which includes settings' (checkboxes)
label as a context for rendering template.
The reason we did this in JS code because of translation issue when
passed (as a context in `partial` handlebars helper) directly within
template.
Currently this is done for notifications' settings.
(There will be no UI change)

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