Removed some spacing.
Shorter sections naming.
Updated the Dutch translation files.
Removed some spacing.
Use the capabilities for reading invoices/customers.
Use plural for menu items.
Name 'Twinfield' in the page title, removed the 'Query' part, i think this is an to technical term.
WordPress Coding Standards optimizations, code indent and create some more spacing.
Use get_admin_page_title() instead of an new text, easier for translations.
Don't like the mix of single and double quotes.
WordPress Coding Standards optimizations, fixed indent use of space, should be tabs.
Changed 'Load %s' to easier text 'Search', this is also how it called in Twinfield itself.
Automatic format by Eclipse to fix indent spaces to tabs.
Manual indent.
Added 'Search for' text.
Use cleaner slug.
Use underscore for page slug.
Use get_admin_page_title();
Added classes attributes, combined password and normal text input render function.