"Origin" should be "Original" in translation export modal

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.3.4 CE GA5, 7.3.10 DXP GA1, Master
• Component/s: Translations Management
• Labels: None
• Story Points: 1
• Fix Priority: 2
• Git Pull Request: https://github.com/liferay-lima/liferay-portal/pull/579

Steps to reproduce:

1. Enable translations
2. Add a web content
3. Click actions > Export for Translation
4. View modal

Expected result:
One of the headers says "Original Language." Or if we have an official term we're going to be using as the starting language in side-by-side translations (source language, base language, etc.), we should go with that term here.

Actual result:
The header says "Origin Language"

Reproduced on:
Tomcat 9.0.33 + MySQL 5.7.
Portal master 6a6ba76a735490af75c9cfbbd4d40281badbff00