Every once in a while people claim that LocalisationUpdate is not working. That is kind of hard to verify because there are many parts, the extension and the WMF integration, taken care by different people, and sometimes people just have different expected behavior.
It would be helpful to write a check-list which people can use to check the logs and examples to confirm there is a problem.
Well, since I just did this once, might as write it down now before I forgot:
Expected results something like (one line for each active branch):
03:44 logmsgbot: l10nupdate@tin ResourceLoader cache refresh completed at Wed Jan 20 03:44:48 UTC 2016 (duration 7m 29s) 03:37 logmsgbot: mwdeploy@tin sync-l10n completed (1.27.0-wmf.11) (duration: 16m 21s)
For example /var/log/l10nupdatelog/l10nupdate.log-20160122.gz (the file without timestamp is usually empty due to rotation and need to check the compressed log).
diff -u /var/lib/l10nupdate/mediawiki/extensions/Echo/i18n/en.json /srv/mediawiki/php-1.27.0-wmf.11/extensions/Echo/i18n/en.json --- /var/lib/l10nupdate/mediawiki/extensions/Echo/i18n/en.json 2016-01-22 02:02:11.657512004 +0000 +++ /srv/mediawiki/php-1.27.0-wmf.11/extensions/Echo/i18n/en.json 2016-01-19 19:38:12.000000000 +0000 @@ -53,7 +53,6 @@ "echo-feedback": "Feedback", "echo-quotation-marks": "\"$1\"", "echo-api-failure": "Could not retrieve notifications. Please try again. (Error $1)", - "echo-api-failure-cross-wiki": "Access to the remote domain was denied.", "echo-notification-placeholder": "There are no notifications.", "echo-notification-loginrequired": "You must login to see your notifications.", "echo-notification-popup-loginrequired": "Please log in to view your notifications.", @@ -127,7 +126,7 @@ "echo-date-yesterday": "Yesterday", "echo-load-more-error": "An error occurred while fetching more results.", "notification-edit-talk-page-bundle": "$1 and $3 {{PLURAL:$4|other|others}} {{GENDER:$1|left}} messages on your [[User talk:$2|talk page]].", - "notification-bundle-header-edit-user-talk-v2": "$1 new {{PLURAL:$2|message|messages}} on {{GENDER:$3|your}} talk page.", + "notification-bundle-header-edit-user-talk-v2": "$1 new {{PLURAL:$2|messages}} on {{GENDER:$3|your}} talk page.", "notification-edit-user-talk-email-batch-bundle-body": "$1 and $2 {{PLURAL:$3|other|others}} {{GENDER:$1|left}} a message on your talk page.", "notification-page-linked-email-batch-bundle-body": "$2 was {{GENDER:$1|linked}} from $3 and $4 other {{PLURAL:$5|page|pages}}.", "echo-email-batch-separator": "--",
notification-bundle-header-edit-user-talk-v2 wont receive updates in any languages because English version differs.
There might be other things to check if this doesn't resolve the mystery.