add translation for writing files in comitium.json (I didn't notice them before)

comitium.go

@@ -118,17 +118,26 @@ func main() {
 	}
 	err = core.Data.WriteSubs(dataPath)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error saving subscriptions: %v\n", err)
+		fmt.Fprintf(os.Stderr, core.TranslateString(
+			"%s\n", "errors.saving",
+			&localizations.Replacements{"file": "subscriptions.gmi", "error": err},
+		))
 		os.Exit(1)
 	}
 	err = core.Data.WriteFeed(dataPath)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error writing feed: %v\n", err)
+		fmt.Fprintf(os.Stderr, core.TranslateString(
+			"%s\n", "errors.saving",
+			&localizations.Replacements{"file": "feed.gmi", "error": err},
+		))
 		os.Exit(1)
 	}
 	err = core.Data.WriteJSON(dataPath)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error saving subscriptions json: %v\n", err)
+		fmt.Fprintf(os.Stderr, core.TranslateString(
+			"%s\n", "errors.saving",
+			&localizations.Replacements{"file": "comtitium.json", "error": err},
+		))
 		os.Exit(1)
 	}
 }

localizations_src/en-US/errors.yaml

@@ -8,6 +8,7 @@ no_url_add: Please provide a URL to add.
 no_url_remove: Please provide a URL to remove.
 url_parse: 'Error parsing URL: {{.error}}'
 url_add: 'Error adding URL: {{.error}}'
+saving: 'Error writing ''{{.file}}'': {{.error}}'
 
 no_argument: '{{.command}} doesn''t take an argument!'
 

localizations_src/fr-FR/errors.yaml

@@ -8,6 +8,7 @@ no_url_add: Merci d'indiquer une URL à ajouter.
 no_url_remove: Merci d'indiquer une URL à supprimer.
 url_parse: 'Erreur lors de l''analyse de l''URL: {{.error}}'
 url_add: 'Erreur lors de l''ajout de l''URL: {{.error}}'
+saving: 'erreur lors de l''écriture de ''{{.file}}'': {{.error}}'
 
 no_argument: '{{.command}} ne prend pas d''argument!'