(minor) make:crud should be consistent with capital letters

[rbaarsma]

In the generated index.html.twig from make:crud, each th field starts with a capital letter, except the "actions" (last column). It would be a minor, but pleasing change, if Actions could be written starting with a capital letter :)

On a sidenote, it would also save time if we can automatically convert field names from <th>camelCase</th> to <th>Camel case</th>, which is the more logical way to name a column