Implement empty translation check. (#15364)

Makefile

@@ -232,6 +232,10 @@ i18n-extract: ## Extract strings for translation from the source code
 	$(GO) get -modfile=go.tools.mod github.com/mattermost/mattermost-utilities/mmgotool
 	$(GOBIN)/mmgotool i18n extract --portal-dir=""
 
+i18n-check: ## Exit on empty translation strings except in english base file
+	$(GO) get -modfile=go.tools.mod github.com/mattermost/mattermost-utilities/mmgotool
+	$(GOBIN)/mmgotool i18n clean-empty --portal-dir="" --check
+
 store-mocks: ## Creates mock files.
 	$(GO) get -modfile=go.tools.mod github.com/vektra/mockery/...
 	$(GOBIN)/mockery -dir store -all -output store/storetest/mocks -note 'Regenerate this file using `make store-mocks`.'

go.mod

@@ -53,7 +53,7 @@ require (
 	github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7
 	github.com/jmhodges/levigo v1.0.0 // indirect
 	github.com/jmoiron/sqlx v1.2.0
-	github.com/jonboulle/clockwork v0.1.0 // indirect
+	github.com/jonboulle/clockwork v0.1.0
 	github.com/lib/pq v1.7.0
 	github.com/magiconair/properties v1.8.1 // indirect
 	github.com/mailru/easyjson v0.7.1 // indirect
@@ -81,7 +81,7 @@ require (
 	github.com/pelletier/go-toml v1.8.0 // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/prometheus/client_golang v1.7.1
-	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/client_model v0.2.0
 	github.com/remyoudompheng/bigfft v0.0.0-20190728182440-6a916e37a237 // indirect
 	github.com/rs/cors v1.7.0
 	github.com/rudderlabs/analytics-go v3.2.1+incompatible

go.tools.mod

@@ -4,7 +4,7 @@ go 1.14
 
 require (
 	github.com/jstemmer/go-junit-report v0.9.1 // indirect
-	github.com/mattermost/mattermost-utilities/mmgotool v0.0.0-20200825115902-a83581379d0a // indirect
+	github.com/mattermost/mattermost-utilities/mmgotool v0.0.0-20200828152206-519b99a4e51e // indirect
 	github.com/philhofer/fwd v1.0.0 // indirect
 	github.com/reflog/struct2interface v0.6.1 // indirect
 	github.com/tinylib/msgp v1.1.2 // indirect

go.tools.sum

@@ -64,6 +64,8 @@ github.com/mattermost/mattermost-utilities/mmgotool v0.0.0-20200821090819-f75693
 github.com/mattermost/mattermost-utilities/mmgotool v0.0.0-20200821090819-f7569391b4d3/go.mod h1:3gKozJI8n2Y/vW37GfnFWAdehGXe5yZlt+HykK6Y3DM=
 github.com/mattermost/mattermost-utilities/mmgotool v0.0.0-20200825115902-a83581379d0a h1:X8TDSx47wrnwa+sSn6Sz3YSHVDyUwN2lA4dVpMdhX+g=
 github.com/mattermost/mattermost-utilities/mmgotool v0.0.0-20200825115902-a83581379d0a/go.mod h1:3gKozJI8n2Y/vW37GfnFWAdehGXe5yZlt+HykK6Y3DM=
+github.com/mattermost/mattermost-utilities/mmgotool v0.0.0-20200828152206-519b99a4e51e h1:dQ+AQmmcn+kncwE/XfC3xVPyegR84d4dno/UOXI3eJs=
+github.com/mattermost/mattermost-utilities/mmgotool v0.0.0-20200828152206-519b99a4e51e/go.mod h1:3gKozJI8n2Y/vW37GfnFWAdehGXe5yZlt+HykK6Y3DM=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=