Fixed #633 and minor search issues

Fixes

Fixes for #633 (closed)

Description

Fixed #633 (closed) and modified the advanced search page by removing the "Keyword" and "Identification number" field and added "Written in" field as discussed.

Tests

a) Search settings

1. Test with search settings as following:
   
2. verify results.

b) Perform a search in the "Written in" field of advanced search.

c) Verify that if on adding search field you get below configurations (Keywords as default) and perform a search.

Checklist:

• My pull request has a descriptive title (not a vague title like "Update index.md").
• My pull request targets the phoenix/develop branch of the repository.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.