Hello,
“it looks weird when editing” – is it fine when the editor is closed? Incorrect displaying in the editor can be also caused by your custom changes in the child theme.
“I want to change the related product text. Would there be an easier way than putting translation?” – https://prnt.sc/VxzgzMu1-AFS , check now – https://prnt.sc/3SwjVdBBuiEV > https://prnt.sc/QEG5SxfReH7J You can change the text as on the screenshot, or disable the Loco Translate plugin and changes will be visible still.
Regards