add translation keys (#246)

* Fix i18n tsc issue

"t" can return null by default.
This was already disabled in the config, but it had no effect on tsc.

* Fix translation in "DefaultNavBar"

key was missing and since this is a constant the translation wouldn't update in case the language got changed after first load.

* Enable typing for i18n translation keys

* Add translation keys

src/components/sourceConfiguration/EditTextPreference.tsx

@@ -16,8 +16,11 @@ import DialogActions from '@mui/material/DialogActions';
 import TextField from '@mui/material/TextField';
 import Button from '@mui/material/Button';
 import { EditTextPreferenceProps } from 'typings';
+import { useTranslation } from 'react-i18next';
 
 export default function EditTextPreference(props: EditTextPreferenceProps) {
+    const { t } = useTranslation();
+
     const { title, summary, dialogTitle, dialogMessage, currentValue, updateValue } = props;
 
     const [internalCurrentValue, setInternalCurrentValue] = useState<string>(currentValue);
@@ -57,10 +60,10 @@ export default function EditTextPreference(props: EditTextPreferenceProps) {
                 </DialogContent>
                 <DialogActions>
                     <Button onClick={handleDialogCancel} color="primary">
-                        Cancel
+                        {t('global.button.cancel')}
                     </Button>
                     <Button onClick={handleDialogSubmit} color="primary">
-                        OK
+                        {t('global.button.ok')}
                     </Button>
                 </DialogActions>
             </Dialog>