docs(l10n): move location-less filter to a separate section

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>

Author: jiangxin

po/README.md

@@ -159,41 +159,6 @@ It will:
   and these location lines will help translation tools to locate
   translation context easily.
 
-Once you are done testing the translation (see below), it's better
-to commit a location-less "po/XX.po" file to save repository space
-and make a user-friendly patch for review.
-
-To save a location-less "po/XX.po" automatically in repository, you
-can:
-
-First, check which filter is configured for your "po/XX.po" file:
-
-```
-git check-attr filter po/XX.po
-```
-
-The filter configuration is defined in the "po/.gitattributes" file.
-
-Then define the driver for the filter. Most languages use the
-"gettext-no-file-no-location" clean filter, which strips out both filenames and
-locations from the comments. To set this up, run the following command:
-
-```shell
-git config --global filter.gettext-no-file-no-location.clean \
-           "msgcat --no-location -"
-```
-
-Some languages use the "gettext-no-location" clean filter, which preserves
-filenames but not locations. For these, install gettext version 0.20 or higher
-and setup the driver as below:
-
-```shell
-git config --global filter.gettext-no-location.clean \
-           "msgcat --add-location=file -"
-```
-
-You're now ready to ask the l10n coordinator to pull from you.
-
 
 ## Fuzzy translation
 
@@ -232,6 +197,44 @@ git-po-helper check-commits <rev-list-opts>
 ```
 
 
+## Preparing a "XX.po" file for commit
+
+Once you are done testing the translation, it's better to commit a
+location-less "po/XX.po" file to save repository space and make a
+user-friendly patch for review.
+
+To save a location-less "po/XX.po" automatically in repository, you
+can:
+
+First, check which filter is configured for your "po/XX.po" file:
+
+```
+git check-attr filter po/XX.po
+```
+
+The filter configuration is defined in the "po/.gitattributes" file.
+
+Then define the driver for the filter. Most languages use the
+"gettext-no-file-no-location" clean filter, which strips out both filenames and
+locations from the comments. To set this up, run the following command:
+
+```shell
+git config --global filter.gettext-no-file-no-location.clean \
+           "msgcat --no-location -"
+```
+
+Some languages use the "gettext-no-location" clean filter, which preserves
+filenames but not locations. For these, install gettext version 0.20 or higher
+and setup the driver as below:
+
+```shell
+git config --global filter.gettext-no-location.clean \
+           "msgcat --add-location=file -"
+```
+
+You're now ready to ask the l10n coordinator to pull from you.
+
+
 ## Marking strings for translation
 
 (This is done by the core developers).