added title option to upload sources

Now you can add the API supported "title" parameter to the crowdin files arguments, like this:

```yaml
files:
- source: /PrestaShop 1.6/modules/blocksocial/translations/en.php
  translation: /PrestaShop 1.6/modules/blocksocial/translations/%two_letters_code%.php
  title: blocksocial
```