Add more attributes to about page

...c/app/+about/about-instance/about-instance.component.html

...c/app/+about/about-instance/about-instance.component.scss

...src/app/+about/about-instance/about-instance.component.ts

...nfig/edit-custom-config/edit-custom-config.component.html

...nfig/edit-custom-config/edit-custom-config.component.scss

...config/edit-custom-config/edit-custom-config.component.ts

...t-video-settings/my-account-video-settings.component.html

...unt-video-settings/my-account-video-settings.component.ts

client/src/app/+my-account/my-account.module.ts

client/src/app/shared/shared.module.ts

config/default.yaml

server/controllers/api/config.ts

server/initializers/config.ts

server/tests/api/check-params/config.ts

server/tests/api/server/config.ts

shared/extra-utils/server/config.ts

shared/models/server/about.model.ts

shared/models/server/custom-config.model.ts