Add placeholder text for bio profile text form

[bagasme]

As per title.

• Add placeholder text
• Localize

[codecov-commenter]

Codecov Report

Merging #12792 into master will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master   #12792   +/-   ##
=======================================
  Coverage   43.23%   43.24%           
=======================================
  Files         650      650           
  Lines       72041    72050    +9     
=======================================
+ Hits        31150    31159    +9     
- Misses      35844    35847    +3     
+ Partials     5047     5044    -3     

Impacted Files	Coverage Δ
modules/migrations/gitlab.go	1.04% <0.00%> (-0.03%)	⬇️
modules/git/utils.go	73.77% <0.00%> (-3.28%)	⬇️
modules/git/repo.go	49.23% <0.00%> (-0.51%)	⬇️
models/issue_comment.go	53.75% <0.00%> (-0.16%)	⬇️
services/pull/pull.go	41.57% <0.00%> (ø)
models/error.go	35.66% <0.00%> (+0.34%)	⬆️
models/notification.go	67.04% <0.00%> (+0.91%)	⬆️
modules/process/manager.go	75.00% <0.00%> (+2.50%)	⬆️
modules/notification/ui/ui.go	83.33% <0.00%> (+2.77%)	⬆️
modules/notification/mail/mail.go	37.93% <0.00%> (+3.44%)	⬆️

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[6543]

think the wording is ok,
and its always good to have selve describing things ...

[6543]

@zeripath ready for 🚀 ?