feat: multi-word dictionary entries

[grantlemons]

There are some cases where you want a spelling to be valid only in a certain context, for instance a title in a foreign language.

For instance, one document I have contains the term Dao De Ching, but it is considered a misspelling. I want these words only to be considered correct when they occur in the complete title. So, for instance Dao on it's own would be considered incorrect, but Dao De Ching would be correct.

I tried adding the complete title to the file dictionary, but this didn't work.