Avoid double-escaping HTML for settings notifications.
Avoid double-escaping HTML for settings notifications.

The i18n.t function already escapes HTML, so we should avoid
calling jQuery's text() method, which double escapes the HTML.

The symptom reported here was that if you changed your
timezone to something like like America/Mexico_City, you'd
see `&#x2F;` instead of `/`.

Most callers to the `ui_report` functions clearly call `i18n.t`
on the messages with code like this:

    ui_report.success(i18n.t("No changes to save!"), status);

There are some exceptions:

    blueslip.js: has really long hard coded messages
    reload.js: mostly says "Reloading...", which perhaps we should
               translate
    settings_account.js: uses helper functions
    settings_lab.js: uses local variable
    settings_org.js: i18n happens in property_types
    ui.js: uses generic_embed_error (unaffected by this change)

Fixes #7280

kou/zulip,synicalsyntax/zulip,hackerkid/zulip,mahim97/zulip,kou/zulip,zulip/zulip,jackrzhang/zulip,dhcrzf/zulip,eeshangarg/zulip,rht/zulip,punchagan/zulip,jackrzhang/zulip,showell/zulip,jackrzhang/zulip,brainwane/zulip,rht/zulip,tommyip/zulip,shubhamdhama/zulip,mahim97/zulip,dhcrzf/zulip,zulip/zulip,rht/zulip,hackerkid/zulip,rishig/zulip,andersk/zulip,hackerkid/zulip,rht/zulip,zulip/zulip,rishig/zulip,hackerkid/zulip,rht/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,timabbott/zulip,synicalsyntax/zulip,rishig/zulip,andersk/zulip,synicalsyntax/zulip,eeshangarg/zulip,timabbott/zulip,dhcrzf/zulip,jackrzhang/zulip,brainwane/zulip,showell/zulip,brainwane/zulip,andersk/zulip,tommyip/zulip,zulip/zulip,dhcrzf/zulip,rishig/zulip,eeshangarg/zulip,shubhamdhama/zulip,showell/zulip,rishig/zulip,dhcrzf/zulip,kou/zulip,synicalsyntax/zulip,mahim97/zulip,kou/zulip,showell/zulip,tommyip/zulip,timabbott/zulip,rishig/zulip,synicalsyntax/zulip,andersk/zulip,eeshangarg/zulip,punchagan/zulip,timabbott/zulip,andersk/zulip,showell/zulip,rht/zulip,zulip/zulip,shubhamdhama/zulip,kou/zulip,showell/zulip,eeshangarg/zulip,hackerkid/zulip,shubhamdhama/zulip,dhcrzf/zulip,hackerkid/zulip,timabbott/zulip,tommyip/zulip,brainwane/zulip,tommyip/zulip,punchagan/zulip,andersk/zulip,jackrzhang/zulip,tommyip/zulip,jackrzhang/zulip,jackrzhang/zulip,mahim97/zulip,synicalsyntax/zulip,rht/zulip,brainwane/zulip,punchagan/zulip,showell/zulip,rishig/zulip,brainwane/zulip,punchagan/zulip,eeshangarg/zulip,eeshangarg/zulip,synicalsyntax/zulip,zulip/zulip,kou/zulip,timabbott/zulip,brainwane/zulip,tommyip/zulip,shubhamdhama/zulip,punchagan/zulip,zulip/zulip,shubhamdhama/zulip,mahim97/zulip,mahim97/zulip,timabbott/zulip,shubhamdhama/zulip,kou/zulip,dhcrzf/zulip