1) Download Translation Aggregator
2) In Era, go to Help -> Settings and make sure Clipboard -> Copy to Clipboard is active
3) In Translation Aggregator, make sure that the button with the tooltip "Automatic Clipboard Translation" is active for "Original Text", "Google" and "JParser".
Now most of the time there's new text on the screen in era, it should be copied to your clipboard. That gets picked up by TA, which will most of the time send it to Google for translation. So if there's untranslated text in the game, you can check the TA window to see what it means.
Sometimes the text will be too long to be automatically translated, in which case you need to start the translation manually by clicking on the "Google" label.
The JParser window is mostly interesting for when Google gets a translation slightly wrong. E.g. there's a kanji that can mean "Breasts" and "Breastmilk", depending on the context. In that case you can hover over the different kanji in the JParser window and see the different meanings.
For other options, see
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