Steps to translate are provided below, through the 'rename tabs and labels' section in setup, but the custom object related list still appears in the original language.
When using Salesforce Translation Workbench, translating custom object labels via Setup > Rename Tabs and Labels may not update the related list label on the page layout. This article explains how to use Translation Workbench to correctly translate custom object related list labels.
Use the Translation Workbench in Salesforce Setup to update the related list label for a custom object in your target language.
Salesforce Classic: Setup | Translation Workbench | Translate
Lightning Experience: Gear icon | Setup | User Interface | Translation Workbench | Translate
Related Topics:
Salesforce Help: Translation Workbench
000385423

We use three kinds of cookies on our websites: required, functional, and advertising. You can choose whether functional and advertising cookies apply. Click on the different cookie categories to find out more about each category and to change the default settings.
Privacy Statement
Required cookies are necessary for basic website functionality. Some examples include: session cookies needed to transmit the website, authentication cookies, and security cookies.
Functional cookies enhance functions, performance, and services on the website. Some examples include: cookies used to analyze site traffic, cookies used for market research, and cookies used to display advertising that is not directed to a particular individual.
Advertising cookies track activity across websites in order to understand a viewer’s interests, and direct them specific marketing. Some examples include: cookies used for remarketing, or interest-based advertising.