[linter] Enable ESLint rule no-console (#3810)

In PR #3806 I noticed that ESLint did not complain about the use of
`console`. Then I realised that the rule `no-console` was not activated.
I have now changed this and replaced a few places where `console` was
used.

We can't apply the rule to all .js files because not all of them use our
logger. Therefore I had to add an extra config block for it.

js/app.js

@@ -364,7 +364,7 @@ function App () {
 				}
 			} catch (error) {
 				Log.error(`Error when stopping node_helper for module ${nodeHelper.name}:`);
-				console.error(error);
+				Log.error(error);
 			}
 		}