LP2021862 Remove placeholders from fm-editor

LP2021862 Remove placeholders from fm-editor

Removes placeholder attributes from the input fields in the fieldmapper
editor, to make it clearer to users which fields have not been filled
out.

Help text is moved from a tooltip to a persistent .form-text area, which
is placed first in the source order for screen reader users' benefit but
appears below the input visually.

Also attaches the Translate button to its input field and prevents it
from wrapping to the next line.

Release-note: Removes placeholder attributes from inputs in the Angular record editor and display field help directly rather than in a tooltip. Also moves the translate button next to text inputs for translatable fields.

Signed-off-by: Stephanie Leary <stephanie.leary@equinoxoli.org>
Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>
Signed-off-by: Jane Sandberg <sandbergja@gmail.com>