add french, fix language selector in settings

note: custom language files can now be added in data/lang/form and will be
listed in settings.

views.go

@@ -1,8 +1,6 @@
 package main
 
 import (
-	"encoding/json"
-	"fmt"
 	"net/http"
 	"strings"
 
@@ -51,9 +49,6 @@ func (app *appContext) InviteProxy(gc *gin.Context) {
 			},
 			"lang": app.storage.lang.Form["strings"],
 		})
-		l, _ := json.MarshalIndent(app.storage.lang.Form, "", "  ")
-		fmt.Println(app.storage.lang.Form["strings"].(map[string]interface{})["validationStrings"].(string))
-		fmt.Printf("%s\n", l)
 	} else {
 		gc.HTML(404, "invalidCode.html", gin.H{
 			"bs5":            app.config.Section("ui").Key("bs5").MustBool(false),