feat: add cmd -g to select the language would reply

cli/flags.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/danielmiessler/fabric/common"
 	"github.com/jessevdk/go-flags"
+	"golang.org/x/text/language"
 )
 
 // Flags create flags struct. the users flags go into this, this will be passed to the chat struct in cli
@@ -39,6 +40,7 @@ type Flags struct {
 	YouTubeTranscript       bool              `long:"transcript" description:"Grab transcript from YouTube video and send to chat"`
 	YouTubeComments         bool              `long:"comments" description:"Grab comments from YouTube video and send to chat"`
 	DryRun                  bool              `long:"dry-run" description:"Show what would be sent to the model without actually sending it"`
+	Language                string            `short:"g" long:"language" description:"Language of the chat" default:"en"`
 }
 
 // Init Initialize flags. returns a Flags struct and an error
@@ -105,5 +107,10 @@ func (o *Flags) BuildChatRequest() (ret *common.ChatRequest) {
 		PatternVariables: o.PatternVariables,
 		Message:          o.Message,
 	}
+	langTag, err := language.Parse(o.Language)
+	if err != nil {
+		langTag = language.English
+	}
+	ret.Language = langTag.String()
 	return
 }