Code cleanup

...on/generic-file-upload/generic-file-upload.component.html

.../components/common/info-dialog/info-dialog.component.html

...nts/common/settings-dialog/settings-dialog.component.html

...components/dcc/dcc-byte-data/dcc-byte-data.component.html

...app/components/dcc/dcc-contact/dcc-contact.component.html

src/app/components/dcc/dcc-data/dcc-data.component.html

...cc/dcc-identifications/dcc-identifications.component.html

.../dcc-localised-string/dcc-localised-string.component.html

...app/components/dcc/dcc-results/dcc-results.component.html

src/app/components/dcc/dcc-upload/dcc-upload.component.html

src/app/components/dcc/dcc.component.html

src/app/components/dcc/dcc.component.scss

src/app/mathml/mathml.component.html

src/assets/i18n/de.json

src/assets/i18n/en.json

src/assets/i18n/es.json

src/assets/i18n/fr.json

src/assets/i18n/pt.json