Read the statement by Michael Teeuw here.
MMM-Voice-Control - only black screen after installation.
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 Initializing MagicMirror. 
 translator.js:182 Loading core translation file: translations/de.json
 translator.js:204 Loading core translation fallback file: translations/en.json
 loader.js:182 Load script: modules/MMM-Voice-Control//MMM-Voice-Control.js
 module.js:415 Module registered: MMM-Voice-Control
 loader.js:152 Bootstrapping module: MMM-Voice-Control
 loader.js:182 Load script: modules/MMM-Voice-Control//node_modules/annyang/annyang.js
 annyang.js Failed to load resource: the server responded with a status of 404 (Not Found)
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 @Q14siX did you run npm installin the module directory?
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 Yes, already several times. But: npm install 
 npm WARN enoent ENOENT: no such file or directory, open ‘/home/pi/MagicMirror/modules/package.json’
 npm WARN enoent ENOENT: no such file or directory, open ‘/home/pi/MagicMirror/modules/node_modules/node_helper/package.json’
 npm WARN modules No description
 npm WARN modules No repository field.
 npm WARN modules No README data
 npm WARN modules No license field.And: ~/MagicMirror/modules/MMM-Voice-Control $ npm install 
 Magic-Mirror-Module-Voice-Control@1.0.0 /home/pi/MagicMirror/modules/MMM-Voice-Control
 └── annyang@2.6.0
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 @Q14siX the second should fix your issue 
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 In the module is an error. 
 The annyang.js file must be manually copied from the directory “dist” to the directory of the module.

