NGO management

[aniri]

Add a new page /ngos/.

UI available here: https://www.figma.com/file/61NHR7fwmV1Dsv4Pb6F8T7/code4ro_mv_user-management_2018.04.21-(Copy)?node-id=754%3A0

This is only visible to master admins (organizer flag set to true).

Add new page for managing NGOs.

Needed functionalities:

• view the list of ngos
• add new ngo / edit existing one
• mark ngo as active / inactive
• nice-to-have: bulk actions should be available when selecting more entries from the table

For each NGO display in the table:

• shortName
• name
• Organizer flag
• active status
• the number of ngo admin belonging to that ngo
• available actions dropdown

_Please use bootstrap classes as much as possible and avoid adding custom css styles to keep the codebase clean & consistent. The new UI should be as similar as possible to the one in figma, not pixel perfect.

Also, make sure all texts are extracted in translation files._