i18n: improve documentation on Transifex scripts

ci/txpull.sh

@@ -2,6 +2,10 @@
 #
 # Fetch the Transifex translations for Calamares and incorporate them
 # into the source tree, adding commits of the different files.
+#
+# Run this (occasionally) at the top-level directory to get
+# new translations. See also CMakeLists.txt and ci/txstats.py
+# for update instructions.
 
 ### INITIAL SETUP
 #

ci/txpush.sh

@@ -1,7 +1,13 @@
 #!/bin/sh
 #
-# Fetch the Transifex translations for Calamares and incorporate them
+# Extract translations from Calamares source and send them
-# into the source tree, adding commits of the different files.
+# to Transifex.
+#
+# Run this at the top-level.
+#
+# Use the --no-tx option to do the extraction, but not the
+# pushing-to-Transifex part. This can be useful to check for
+# new strings or when testing the tools themselves.
 
 ### INITIAL SETUP
 #