UI Design: Modal language update and add. 'save' snackbar

### Show Snackbar when Saving

This came up as a nice-to-have improvement from ux perspective. Provide visual feedback when user hits "save" button on any filing. Right now if the user hits save, there is no Visual Feedback for the user which violates users expectations and they may wonder if anything happened as a result of them hitting the button. I haven't received complaints about this as a problem so I've shifted it to very low priority on my design backlog.

**Dependancies**
Some filings do not have a save button (ie: officers)

**Criteria**
- When user hits 'save', display snackbar - even if there have been NO changes made on the application
- Display the snackbar about 72 px / 4.5 rem from the bottom of the viewport to avoid overlapping with the footer when at the bottom of the page
- The snackbar is sticky despite scrolling action
- This snackbar has already been implemented on the [My Business Registry page](

https://dev.business-registry-dashboard.bcregistry.gov.bc.ca/account/3602) which is already in NUXT, but it displays too low on the page and overlaps with footer.

### Language Update

**Criteria**
If changes were made in the filing and the user selects cancel, the modal displays - Update language on the modal to "You have unsaved changes. Are you sure you want to exit?"