fix: individual page validation messages (resolves #1751, #1752)

[jobara]

Resolves #1751
Resolves #1752

• Single validation message for missing bio
• Replace "region" with "provinces and territories" in validation message for missing region

Prerequisites

If this PR changes PHP code or dependencies:

• I've run composer format and fixed any code formatting issues.
• I've run composer analyze and addressed any static analysis issues.
• I've run php artisan test and ensured that all tests pass.
• I've run composer localize to update localization source files and committed any changes.

If this PR changes CSS or JavaScript code or dependencies:

• I've run npm run lint and fixed any linting issues.
• I've run npm run build and ensured that CSS and JavaScript assets can be compiled.

[codecov]

Codecov Report

Merging #1767 (bedbb7a) into dev (974f3d4) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##                dev    #1767   +/-   ##
=========================================
  Coverage     96.47%   96.47%           
  Complexity     1984     1984           
=========================================
  Files           299      299           
  Lines          8620     8620           
=========================================
  Hits           8316     8316           
  Misses          304      304           

Impacted Files	Coverage Δ
app/Http/Requests/UpdateIndividualRequest.php	100.00% <100.00%> (ø)
app/Http/Requests/UpdateProjectRequest.php	100.00% <100.00%> (ø)