Update macro to wrap defaults in brackets when necessary

[heyimalex]

I noticed that the Trans macro generates invalid code when children contains a double quote. From ast explorer:

// before
<Trans>"</Trans>;
// after
<Trans defaults="\"" components={[]} values={{}} />;

According to the JSX spec this isn't valid; JSX doesn't support any kind of escaping inside of " quoted attributes. Babel, tsc, prettier, etc all fail when parsing. To get around this we can just wrap the value in brackets. I made it only happen when the string in question contains a quote.

// before
<Trans>"</Trans>;
// after
- <Trans defaults="\"" components={[]} values={{}} />;
+ <Trans defaults={"\""} components={[]} values={{}} />;

I am kinda confused about how this is working today without issue.

I think we could also defaults.replace(/"/g, """) instead if that's preferred.

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included

[coveralls]

Coverage increased (+0.01%) to 96.078% when pulling 1b8aefa on heyimalex:fix-macro-unescaped into 8e1e852 on i18next:master.

[jamuhl]

Don't know the specs in detail but assumed we can just escape...guess this is ok...

[adrai]

It's included in v11.16.2