po4a: add page (#6493)

pages/linux/po4a-gettextize.md

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+# po4a-gettextize
+
+> Convert a file to a PO file.
+> More information: <https://po4a.org/man/man1/po4a-gettextize.1.php>.
+
+- Convert a text file to PO file:
+
+`po4a-gettextize --format {{text}} --master {{path/to/master.txt}} --po {{path/to/result.po}}`
+
+- Get a list of available formats:
+
+`po4a-gettextize --help-format`
+
+- Convert a text file along with a translated document to a PO file (`-l` option can be provied multiple times):
+
+`po4a-gettextize --format {{text}} --master {{path/to/master.txt}} --localized {{path/to/translated.txt}} --po {{path/to/result.po}}`

pages/linux/po4a-translate.md

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+# po4a-translate
+
+> Convert a PO file back to documentation format.
+> The provided PO file should be the translation of the POT file which was produced by `po4a-gettextize`.
+> More information: <https://po4a.org/man/man1/po4a-translate.1.php>.
+
+- Convert a translated PO file back to a document:
+
+`po4a-translate --format {{text}} --master {{path/to/master.doc}} --po {{path/to/result.po}} --localized {{path/to/translated.txt}}`
+
+- Get a list of available formats:
+
+`po4a-translate --help-format`

pages/linux/po4a-updatepo.md

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+# po4a-updatepo
+
+> Update the translation (in PO format) of a documentation.
+> More information: <https://po4a.org/man/man1/po4a-updatepo.1.php>.
+
+- Update a PO file according to the modification of its origin file:
+
+`po4a-updatepo --format {{text}} --master {{path/to/master.txt}} --po {{path/to/result.po}}`
+
+- Get a list of available formats:
+
+`po4a-updatepo --help-format`
+
+- Update several PO files according to the modification of their origin file:
+
+`po4a-updatepo --format {{text}} --master {{path/to/master.txt}} --po {{path/to/po1.po}} --po {{path/to/po2.po}}`

pages/linux/po4a.md

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+# po4a
+
+> Update both PO files and translated documents.
+> More information: <https://po4a.org/man/man1/po4a.1.php>.
+
+- Update PO files and documents according to the specified config file:
+
+`po4a {{path/to/config_file}}`