E-Mail notifications: localize subject line and offer separate prefix

[rasos]

Subject line of E-Mail notifications are English only: "[site name] You have been direct messaged by ... ".
Please consider i18n, when working on #741 or on RocketChat/feature-requests#787.
Also, (our rather long) site name is not an ideal prefix, so please offer an extra E-Mail subject line prefix in the administration settings for E-Mail.

Our Rocket.Chat version: 0.37

[rasos]

i18n and some design is also needed for self-registration message:
Hello, To verify your account email, simply click the link below.
Now the link is even not clickable in most e-mail browsers.

[pkgodara]

@rasos Does #7342 meet the requirement. Subject lines are localized, Administration -> Email -> Subject. You can use some predefined prefixes or just write whatever you like in the subject line.

[isabellarussell]

This issue is now closed as the feature is not on our short term roadmap but may be revisited once other priorities have been addressed.