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You will see that the whole definition is in one block without any formatting and difficult to read. I thought it might be nice to add a minimal formatting. One easy way would be by replacing all LF by <b/>. In the replace box of notepad++ select "Search mode: extended." You can search LF by "\n".
Find what: \n
Replace with: <b/>
This will give you, for instance
Synonymes :<b/> - aveuli<b/> - mou<b/> - ramolli<b/> - se relācher<b/>
But it will give you also </w><b/>. This however we do not want, therefore we replace </w><b/> by </w>.
The drawback of this formatting is that it uses a lot of space on the screen, and you will probably have to go through several pages in order to read the definition of an entry. Therefore, it maybe better to replace the LF by something else that gives you a hint about the the structure of the information, maybe "||" or any good visible symbol.
Another thing: When producing the index file choose for encoding "encode in UTF-8 without BOM". If you choose "encode in UTF-8" the first line will not be taken into account by the dictionary engine.