strings must not begin or end with white spaces, reported by phpcs

hii,
Translatable strings must not begin or end with white spaces, use placeholders with t() for variables

@sonam_sharma Have you checked the theme and do you know the functionality?
In title the increment variable is used to create a title with id for different slides.
This is a requirements not a bug.
If we don't add space after title then it will concatenate the $i value with slider text and without that it will look bad user experience.