VSPC-274 added search option

[ajay3568yadav]

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Please confirm the following by adding an x for each item (turn [ ] into [x]).

• I have removed all code style changes that are not necessary (e.g. changing blanks across the whole file that don’t need to be changed, adding empty lines in parts other than your own code)
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Please provide a brief description of your ticket

(you can copy the ticket if it hasn't changed)

the input field to select the exhibition languages should be searchable (so you can type to find a language)

selected languages should be shown on top, so it’s easy to see what is currently selected

languages should be sorted alphabetically

there seem to be some characters that are not displayed right.

Anything else the reviewer needs to know?

https://diging.atlassian.net/browse/VSPC-274

[diging-jenkins]

Can one of the admins verify this patch?

[diging-jenkins]

Can one of the admins verify this patch?