Search option for contentblocks picker (searches within category)

[bramdoppen]

Search for contentblocks within the selected category. Closes #26

It's an input value that filters the array, as seen here:

Features

• Search input has autofocus when you open the overlay;
• When you close this overlay, the input will be cleared (don't know if users prefer to keep their search, but if needed we can change that in the future);
• Search input won't be cleared when changing tabs (when you look for a specific block, it will be there when you click through the tabs, can also change in future).

Demo

[PerplexDaniel]

Very nice! We just need to put the static text in localization files before we can release it (with Google Translate for Danish ;-)).