[BUGFIX] add preloader until slider is initialized #442
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Description: when we use slider container, content before the slider was created, is shown.
Solusion: Add preloader until slider is initialized
https://www.youtube.com/watch?v=6zTgQdhc5AE&feature=youtu.be - t3kit
https://www.youtube.com/watch?v=zFnw-vIVuKg&feature=youtu.be - when slides contain more content