Update search modal for i18n

[h-enk]

Description

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thuliteio/doks#1389 (reply in thread)

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Environment

Paste the information here as shown by hugo version && npm --version

[Backspaze]

As mentioned in thuliteio/doks#1389 (reply in thread).

The word for is hardcoded in {{ i18n "search_no_results" }} for in node_modules/@thulite/doks-core/layouts/_partials/header/search-modal.html.