* MM-27507: Propagate rate limit errors to client
We return an error from SendInviteEmails instead of just logging it
to let the client know that a rate limit error has happened.
The status code is chosen as 413 (entity too large) instead of 429 (too many requests)
because it's not the request which is rate limited, but the payload inside it which is.
Ideally, the email sending should have been implemented by a queue which would just return
an error to the client when full. That is also why we are not returning an X-Retry-After
and X-Reset-After in the headers because that would mix with the actual rate limiting.
A separate header X-Email-Invite-Reset-After might do the job, but it comes at an extra cost
of additional API surface and a clunky API. Instead, that information is contained in the error
response. The web client needs to just surface the error. An API client will have to do
a bit more work to parse the error if it needs to automatically know when to retry. Given that
an email sending client is not a very common use case, we decide to keep the API clean.
This decision can be revisited if it becomes problematic in the future.
https://mattermost.atlassian.net/browse/MM-27507
* Fixing translations
* Added retry_after and reset_after in API response.
* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* MM-16369: include potential subpath in emails
Various email templates were extracting the `Host` but not the `Path` from the SiteURL, excluding a potential subpath defined therein.
* improve coverage of condenseSiteURL
* Implementation to Make all Mattermost system emails Multi-Part, with both a HTML and Plain Text version
* update lib
* update code per review
* update to use the mattermost repo
* Adding initial race detector
* Remove setting of config twice
* Fixing config file watch and config reload on license save
* Fixing config file watch and config reload on license save
* Fixing build error
* Fixing locking issue
* Fixing makefile
* Fixing race in config
* Fixing race in status unit test
* Adding EE race tests
* Fixing race in cluster info
* Removing code that's isn't needed
* Fixing some more races
* Fixing govet issue
