Customize discovery v 6.3 messages

[Grisel Pascual]

Hello all. I'm new to Dspace, I'm using the 6.3 version.

I added some customize filters in Discovery. They are working in the sense that they return results, but I am having some problems with the visualization of the filters in the advanced search box and in the sidebar, as you can see in this attached images

I can't seem to find the solution to this, can you help me? I searched the wiki, and this is what it says:

Internationalization

Discovery has its own messages.xml file, located at dspace-xmlui/src/main/resources/aspects/Discovery/i18n/messages.xml.  To add your own labels for new fields and facets in a Maven overlay, copy this file to dspace/modules/xmlui/src/main/resources/aspects/Discovery/i18n/messages.xml and modify this file. Alternatively, you may add them to the main messages.xml file. Same goes for translations - it's encouraged to submit a single messages_XX.xml file including messages from all the separate messages.xml files in DSpace.

But I have two problems with this. One of them is that I need the message for the filter to be in spanish. The other one, is that I can't find this route dspace/modules/xmlui/src/main/resources/aspects/Discovery/i18n/messages.xml. In my src directory, this is what it looks like when I try

Thanks in advance, any help would be appreciated