Make 'Default language' in SSPI config empty, unless changed by admin

Author: quasoft

options/locale/locale_en-US.ini

@@ -1823,7 +1823,7 @@ auths.sspi_strip_domain_names_helper = If checked, domain names will be removed
 auths.sspi_separator_replacement = Separator to use instead of \, / and @
 auths.sspi_separator_replacement_helper = The character to use to replace the separators of down-level logon names (eg. the \ in "DOMAIN\user") and user principal names (eg. the @ in "user@example.org").
 auths.sspi_default_language = Default user language
-auths.sspi_default_language_helper = Default language for users automatically created by SSPI auth method
+auths.sspi_default_language_helper = Default language for users automatically created by SSPI auth method. Leave empty if you prefer language to be automatically detected.
 auths.tips = Tips
 auths.tips.oauth2.general = OAuth2 Authentication
 auths.tips.oauth2.general.tip = When registering a new OAuth2 authentication, the callback/redirect URL should be: <host>/user/oauth2/<Authentication Name>/callback

routers/admin/auths.go

@@ -94,7 +94,7 @@ func NewAuthSource(ctx *context.Context) {
 	ctx.Data["SSPIAutoActivateUsers"] = true
 	ctx.Data["SSPIStripDomainNames"] = true
 	ctx.Data["SSPISeparatorReplacement"] = "_"
-	ctx.Data["SSPIDefaultLanguage"] = "en-US"
+	ctx.Data["SSPIDefaultLanguage"] = ""
 
 	// only the first as default
 	for key := range models.OAuth2Providers {
@@ -177,7 +177,7 @@ func parseSSPIConfig(ctx *context.Context, form auth.AuthenticationForm) (*model
 		return nil, errors.New(ctx.Tr("form.SSPISeparatorReplacement") + ctx.Tr("form.alpha_dash_dot_error"))
 	}
 
-	if !langCodePattern.MatchString(form.SSPIDefaultLanguage) {
+	if !util.IsEmptyString(form.SSPIDefaultLanguage) && !langCodePattern.MatchString(form.SSPIDefaultLanguage) {
 		ctx.Data["Err_SSPIDefaultLanguage"] = true
 		return nil, errors.New(ctx.Tr("form.lang_select_error"))
 	}
@@ -209,7 +209,7 @@ func NewAuthSourcePost(ctx *context.Context, form auth.AuthenticationForm) {
 	ctx.Data["SSPIAutoActivateUsers"] = true
 	ctx.Data["SSPIStripDomainNames"] = true
 	ctx.Data["SSPISeparatorReplacement"] = "_"
-	ctx.Data["SSPIDefaultLanguage"] = "en-US"
+	ctx.Data["SSPIDefaultLanguage"] = ""
 
 	hasTLS := false
 	var config core.Conversion

templates/admin/auth/edit.tmpl

@@ -249,6 +249,7 @@
 							<i class="dropdown icon"></i>
 							<div class="text">{{range .AllLangs}}{{if eq $cfg.DefaultLanguage .Lang}}{{.Name}}{{end}}{{end}}</div>
 							<div class="menu">
+								<div class="item{{if not $.SSPIDefaultLanguage}} active selected{{end}}" data-value="">-</div>
 							{{range .AllLangs}}
 								<div class="item{{if eq $cfg.DefaultLanguage .Lang}} active selected{{end}}" data-value="{{.Lang}}">{{.Name}}</div>
 							{{end}}

templates/admin/auth/source/sspi.tmpl

@@ -32,6 +32,7 @@
 			<i class="dropdown icon"></i>
 			<div class="text">{{range .AllLangs}}{{if eq $.SSPIDefaultLanguage .Lang}}{{.Name}}{{end}}{{end}}</div>
 			<div class="menu">
+				<div class="item{{if not $.SSPIDefaultLanguage}} active selected{{end}}" data-value="">-</div>
 			{{range .AllLangs}}
 				<div class="item{{if eq $.SSPIDefaultLanguage .Lang}} active selected{{end}}" data-value="{{.Lang}}">{{.Name}}</div>
 			{{end}}