You can localize software using Excel .xls and .xlsx files easily with POEditor. Here is how the translation process goes:
1. Create translation project
Login to your account, create a new translation project and add a language to it.
2. Import Excel file
Use import button in the Project page to import your .xls or .xlsx file (you can import both the terms and the translations), having the information structured in the following order: terms, translations, context, reference and comments.
*Note: If your terms are IDs (labels), go to Project Settings and set this language as a Default Reference Language.
3. Start localization
Add your desired languages for translation, invite your contributors to join and start localizing your Excel worksheets.
When the translation is done, you can export each of your Excel .xls files using Export function from Options Menu from the language page.