Add:docs:sample files list (nl) to use for speech

[adevoss]

Edit documentation and add a Dutch sample files list to use for speech.

Fixes #1482

[christf]

I do not think this is adequate. As doumented below, to make this feature useful, vocabulary_name_systematic needs to be set. Did that work for you?

[adevoss]

Yes it works for me.

How I understand the docs: vocabulary_name_systematic announces street names. Street names are names like "Main street" or "Elvis Presley road".
When I drive I don't need to hear the name of the street. All I want to hear is: "Turn right after 200 meter". The names of the current and next street are on my OSD.

Using #1259 you can set vocabulary_name_systematic="1" if you want. All the street names are spoken by TTS (if you don't have a sample file for that street name).
Never tested this but I will test this soon and let you know the result.

Even with vocabulary_name_systematic="0" there are names of town in the navigation instructions. These instructions are something like this: "Take the next exit towards Amsterdam". If you use the the trunk` branch and sample files then this instruction is not played. Navit stays silent.
Only because one word ("Amsterdam") is missing.

Using #1259 all the available samples are played. Text without sample files is spoken by TTS.
So taking the example above and you have a complete set of sample files: Samples are played for the first part, followed by TTS speaking "Amsterdam".

Instead of Navit staying silent the whole instruction is played.