Firefox 74 is not open for new sign-offs. It's either too early or too late to do that. There is a current accepted sign-off, which is used for shipping Firefox 74.
|Feb. 24, 2020
|4560 missing, 1 warning, 1836 obsolete, (52%)
Bug 1608199 - Port devtools/client/styleeditor.dtd to Fluent, part 1.
xh team [Pootle] <https://wiki.mozilla.org/L10n:Teams:xh> rev 5d5889f5a313
Francesco Lodolo accepted sign-off by Francesco Lodolo on Feb. 24, 2020