strings: fix typos on internet_downloaded

[MarcoAurelioWM]

Summary
Fixes #2735 i18n: internet_downloaded: typos

Changes made

• Dot and space.
• 'internet' -> 'the Internet'.
• Final dot at the end of the string

[codecov-io]

Codecov Report

Merging #2736 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2736   +/-   ##
======================================
  Coverage    2.72%   2.72%           
======================================
  Files         267     267           
  Lines       12801   12801           
  Branches     1137    1137           
======================================
  Hits          349     349           
  Misses      12426   12426           
  Partials       26      26

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