Here are the steps of how to modify the translation of your layers.
1- Sign-in with your translator account
2- Click on Translations then click on Layers
3- Here you will find listed all your layers where you can update and manage the translation of any layer
4- Choose your reference language that your metadata will be translated from
5- Click the small arrow beside the layer that you want to manage its translation
6- Your layer translation will be divided into two parts: Layer data and layer fields You can edit manually any translation by writing directly in the corresponding cell with the language that you want to translate to then click save
7- After your manual modification (or any modifications) you will notice that this layer will be labeled with Updated which means that the translation on this layer has been modified
8- You can reset back this layer to the original auto-translation by clicking on Reset (this will reset all the data) then click Yes in the pop-up message to confirm
9- Any modifications made to your data, for example a new field is added, can be automatically translated to all the languages that you want by selecting this field (row) and the languages that you want (column) then click on Auto Translate Selected
10- You can Click cancel to discard changes