Quotes are called Quotes in my country. How do I change its name in Zoho Invoice?

You can edit the title from ‘Estimate’ to ‘Quote’ or vice-versa easily by performing the following steps:

• Click on the Gear icon on the top right corner.

• Navigate to Templates -> Quotes.

• Choose the template and click on Edit.

• Click on the Header option on the left pane.

• Under Document Title , edit the Title field from Estimate to a text of your choice(Eg: Quote).
  

• Click Save for the changes to take effect.