lightbox_overlay: “Pan and Zoom” → “Pan & zoom”.
lightbox_overlay: “Pan and Zoom” → “Pan & zoom”.

The ‘t’ helper operates on text strings, not HTML.  The ‘&’ works
fine, and is correctly escaped for output by Handlebars, like any text
string interpolated with ‘{{}}’.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulip.com>

rht/zulip,zulip/zulip,rht/zulip,hackerkid/zulip,eeshangarg/zulip,punchagan/zulip,eeshangarg/zulip,punchagan/zulip,rht/zulip,hackerkid/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,punchagan/zulip,punchagan/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,rht/zulip,andersk/zulip,punchagan/zulip,punchagan/zulip,kou/zulip,kou/zulip,zulip/zulip,zulip/zulip,kou/zulip,kou/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,punchagan/zulip,andersk/zulip,kou/zulip,hackerkid/zulip,rht/zulip,kou/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,hackerkid/zulip,eeshangarg/zulip,hackerkid/zulip,rht/zulip,eeshangarg/zulip