grep: add Dutch translation and fix placeholder highlight

[sebastiaanspeck]

• [x] The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• [x] The page(s) have at most 8 examples.
• [x] The page description(s) have links to documentation or a homepage.
• [x] The page(s) follow the content guidelines.
• [x] The PR title conforms to the recommended templates.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.nl/common/grep.md is outdated, based on the command contents itself.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.de/common/grep.md is outdated, based on number of commands.
• The page pages.es/common/grep.md is outdated, based on the command contents itself.
• The page pages.fa/common/grep.md is outdated, based on the command contents itself.
• The page pages.fr/common/grep.md is outdated, based on number of commands.
• The page pages.ko/common/grep.md is outdated, based on the command contents itself.
• The page pages.pt_BR/common/grep.md is outdated, based on the command contents itself.
• The page pages.ru/common/grep.md is outdated, based on the command contents itself.
• The page pages.ta/common/grep.md is outdated, based on the command contents itself.
• The page pages.tr/common/grep.md is outdated, based on the command contents itself.
• The page pages.zh/common/grep.md is outdated, based on the command contents itself.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[sebastiaanspeck]

Thanks for your contribution, IG it is fine to have the placeholder as it is in the previous format (since all commands are long options here) instead of moving it inside the placeholder too.

Let's see what others think.

The idea originated when looking at this page and comparing the two different styles of highlighting the options.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.de/common/grep.md is outdated, based on number of commands.
• The page pages.es/common/grep.md is outdated, based on the command contents itself.
• The page pages.fa/common/grep.md is outdated, based on the command contents itself.
• The page pages.fr/common/grep.md is outdated, based on number of commands.
• The page pages.ko/common/grep.md is outdated, based on the command contents itself.
• The page pages.pt_BR/common/grep.md is outdated, based on the command contents itself.
• The page pages.ru/common/grep.md is outdated, based on the command contents itself.
• The page pages.ta/common/grep.md is outdated, based on the command contents itself.
• The page pages.tr/common/grep.md is outdated, based on the command contents itself.
• The page pages.zh/common/grep.md is outdated, based on the command contents itself.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.de/common/grep.md is outdated, based on number of commands.
• The page pages.fa/common/grep.md is outdated, based on the command contents itself.
• The page pages.fr/common/grep.md is outdated, based on number of commands.
• The page pages.ko/common/grep.md is outdated, based on the command contents itself.
• The page pages.pt_BR/common/grep.md is outdated, based on the command contents itself.
• The page pages.ru/common/grep.md is outdated, based on the command contents itself.
• The page pages.ta/common/grep.md is outdated, based on the command contents itself.
• The page pages.tr/common/grep.md is outdated, based on the command contents itself.
• The page pages.zh/common/grep.md is outdated, based on the command contents itself.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.de/common/grep.md is outdated, based on number of commands.
• The page pages.fa/common/grep.md is outdated, based on the command contents itself.
• The page pages.fr/common/grep.md is outdated, based on number of commands.
• The page pages.ko/common/grep.md is outdated, based on the command contents itself.
• The page pages.pt_BR/common/grep.md is outdated, based on the command contents itself.
• The page pages.ru/common/grep.md is outdated, based on the command contents itself.
• The page pages.ta/common/grep.md is outdated, based on the command contents itself.
• The page pages.tr/common/grep.md is outdated, based on the command contents itself.
• The page pages.zh/common/grep.md is outdated, based on the command contents itself.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.de/common/grep.md is outdated, based on number of commands.
• The page pages.fa/common/grep.md is outdated, based on the command contents itself.
• The page pages.fr/common/grep.md is outdated, based on number of commands.
• The page pages.ko/common/grep.md is outdated, based on the command contents itself.
• The page pages.pt_BR/common/grep.md is outdated, based on the command contents itself.
• The page pages.ru/common/grep.md is outdated, based on the command contents itself.
• The page pages.ta/common/grep.md is outdated, based on the command contents itself.
• The page pages.tr/common/grep.md is outdated, based on the command contents itself.
• The page pages.zh/common/grep.md is outdated, based on the command contents itself.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.de/common/grep.md is outdated, based on number of commands.
• The page pages.fa/common/grep.md is outdated, based on the command contents itself.
• The page pages.fr/common/grep.md is outdated, based on number of commands.
• The page pages.ko/common/grep.md is outdated, based on the command contents itself.
• The page pages.pt_BR/common/grep.md is outdated, based on the command contents itself.
• The page pages.ru/common/grep.md is outdated, based on the command contents itself.
• The page pages.ta/common/grep.md is outdated, based on the command contents itself.
• The page pages.tr/common/grep.md is outdated, based on the command contents itself.
• The page pages.zh/common/grep.md is outdated, based on the command contents itself.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.