Visual Studio
You can of course use Visual Studio, but its not a great way to do multiple languages.
Zeta Resource Editor
https://www.zeta-resource-editor.com/
Free language editor tool. Simply give it a AppLocalization.resz file for language. Each is shown in the editor simply as a new column.
lingohub.com
Setup A New Lingohub Project
On each of your applicaitons forms set the 'Localizable' property to True.
Framework: Windows resx
Add Languages > Set the source (origin) language to English and add the first language to translate into.
Uploading Resource Files
Close the project > Select Upload resource file > Select all of the .resx files
It may say it can't determine the language for files so set the language to English or your default langauge.
Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.