Enhancement: Enable and configure `concat_space` fixer

Closes GH-657.

Enhancement: Enable `array_syntax` fixer

Co-authored-by: MathiasReker <mathias@reker.dk>

Closes GH-659.

Enhancement: Enable `strict_param` fixer

We set strict param to false to ensure current behavior,
except for two cases where it is safe to go with true.

Closes GH-658.

Swap uses of _SERVER[DOCUMENT_ROOT] for __DIR__

2/4 - Update remaining except archives/ and release/.

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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Link to the Guide for Manual Contributors

Archived langs update

Revert "We have archives for every inactive language currently, don't we?"

This reverts commit 2abc210fc1ac759fa8f804158af0970f41284ded.

We have archives for every inactive language currently, don't we?

Swap the logic, we only have archives of 2 translations these days

See also bug #65178

Replaced dochowto links with fresh links to the wiki version of the howto.

CVS->SVN

Hack to remove archive link to non-existent archives, so this closes bug #44969
# Only (ar) falls in this category today

formatting: changed a <strong> to <h3>

Fixed typo

Added information about why some translations are missing, and how people can help.
This will be found via the lang select box as "Other"