Unify interpolation delimiters

[lex111]

This is related to #78

Unfortunately, the "Leave an issue" link on the JS survey does not actually work now.

So I think we need to go back to interpolation delimiters (without "$") in Vulcan.js style, and for survey results on Gatsby define custom delimiters in the Lodash template in translator.js file, this way interpolation will work the same for both frameworks.

cc @SachaG

[SachaG]

Good point! To clarify, we're talking about

• hello ${name}, how are you today?

vs

• hello {name}, how are you today?

The first one seems more standard to me since it's already how string interpolation works in JS, so maybe we should keep that?

[lex111]

It doesn't really matter, I just didn't find a way to define custom delimiters in Vulcan.js, but in Lodash (i.e. Gatsby results app) it's possible.

[SachaG]

Oh actually I think you were right, if we use ${} then it becomes a pain to escape the $ when the strings are defined in JavaScript files. Let's change it the other way around then.