please cut up help text of xargs into manageable translatable chunks

[Benno Schulenberg]

Hi,

In the POT file for findutils-4.5.11 the help text for xargs
appeared as one big msgid.  Please divide this large text
into some twenty separate strings, each encompassing
a single paragraph or option.  This is much friendlier for
translators, especially when in the future something in
this help text changes.

(Also, please do not use capitals at the start of the option
descriptions, nor periods at their end; they are not the
common way; please use semicolons where needed.)

Regards,

Benno

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