Support sending post language with --lang flag

cmd/writeas/api.go

@@ -68,6 +68,9 @@ func DoPost(c *cli.Context, post []byte, font string, encrypt, tor, code bool) e
 		Font:       getFont(code, font),
 		Collection: collection(c),
 	}
+	if lang := language(c); lang != "" {
+		pp.Language = &lang
+	}
 	p, err := cl.CreatePost(pp)
 	if err != nil {
 		return fmt.Errorf("Unable to post: %v", err)

cmd/writeas/cli.go

@@ -54,6 +54,11 @@ var postFlags = []cli.Flag{
 		Value: defaultFont,
 	},
 	cli.StringFlag{
+		Name:  "lang",
+		Usage: "Sets post language to given ISO 639-1 language code",
+		Value: "",
+	},
+	cli.StringFlag{
 		Name:  "user-agent",
 		Usage: "Sets the User-Agent for API requests",
 		Value: "",

cmd/writeas/options.go

@@ -16,6 +16,10 @@ func isTor(c *cli.Context) bool {
 	return c.Bool("tor") || c.Bool("t")
 }
 
+func language(c *cli.Context) string {
+	return c.String("lang")
+}
+
 func collection(c *cli.Context) string {
 	if coll := c.String("c"); coll != "" {
 		return coll