Missing text domains

[yoancutillas]

Hello,

In includes/Widget.php lines 47, 48 (twice) and 54,

there are four missing text domains, can you add them?

• _x( 'Search for:', 'label', 'wedocs' )
• esc_attrx( 'Documentation Search …', 'placeholder', 'wedocs'_ )
• esc_attrx( 'Search for:', 'label', 'wedocs'_ )
• esc_attrx( 'Search', 'submit button', 'wedocs'_ )

because these strings cannot be translated otherwise.

Thank you!