Interface Copy

Audit every string the UI shows: buttons, labels, nav, empty, error, toast, placeholder, title.

Rewrite in place:

• button = the outcome ("Save changes", not "Submit")
• error = how to fix it
• empty = why it's empty + the next action
• sentence case
• one word for one thing; if two labels mean the same, pick one and kill the other
• no "please", no "something went wrong"

Do not change layout, color, or type. Table: before | after | why.