MM-41988 Updated links to legacy domain about.mm.com (#19552)

* Updated links to legacy domain about.mm.com

* Legacy link updates

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* Reverting - only need to change en.json

* about.mm.com URL updates

* mattermost.org URL updates

* forum.mm.org URL update

* Update .github/ISSUE_TEMPLATE.md

* Update .github/ISSUE_TEMPLATE.md

* Un-deleted language files

* Update README.md

* Update tests/test-config.json

* fix some test due to url updating (#19787)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>
Co-authored-by: Harrison Healey <harrisonmhealey@gmail.com>
Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

model/config.go

@@ -131,9 +131,9 @@ const (
 
 	SupportSettingsDefaultTermsOfServiceLink = "https://mattermost.com/terms-of-use/"
 	SupportSettingsDefaultPrivacyPolicyLink  = "https://mattermost.com/privacy-policy/"
-	SupportSettingsDefaultAboutLink          = "https://about.mattermost.com/default-about/"
-	SupportSettingsDefaultHelpLink           = "https://about.mattermost.com/default-help/"
-	SupportSettingsDefaultReportAProblemLink = "https://about.mattermost.com/default-report-a-problem/"
+	SupportSettingsDefaultAboutLink          = "https://docs.mattermost.com/about/product.html/"
+	SupportSettingsDefaultHelpLink           = "https://mattermost.com/default-help/"
+	SupportSettingsDefaultReportAProblemLink = "https://mattermost.com/default-report-a-problem/"
 	SupportSettingsDefaultSupportEmail       = ""
 	SupportSettingsDefaultReAcceptancePeriod = 365
 
@@ -170,8 +170,8 @@ const (
 	SamlSettingsDefaultCanonicalAlgorithm = SamlSettingsCanonicalAlgorithmC14n
 
 	NativeappSettingsDefaultAppDownloadLink        = "https://mattermost.com/download/#mattermostApps"
-	NativeappSettingsDefaultAndroidAppDownloadLink = "https://about.mattermost.com/mattermost-android-app/"
-	NativeappSettingsDefaultIosAppDownloadLink     = "https://about.mattermost.com/mattermost-ios-app/"
+	NativeappSettingsDefaultAndroidAppDownloadLink = "https://mattermost.com/mattermost-android-app/"
+	NativeappSettingsDefaultIosAppDownloadLink     = "https://mattermost.com/mattermost-ios-app/"
 
 	ExperimentalSettingsDefaultLinkMetadataTimeoutMilliseconds = 5000