Hi Carcam,
here the Support Information
PHP Version : 5.6.17-0+deb8u1
MySQL Version : 5.5.5-10.0.23-MariaDB-0+deb8u1
Server Information : Linux unterwegs 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u4 (2016-02-29) x86_64
Fix jQuery? : Yes
Load JEvents Bootstrap CSS? : Yes
Max Input Vars ? : 1000
Club code set? : No
User Agent : Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 Iceweasel/38.7.1
Joomla : 3.5.0
component_com_jevents : 3.4.8
component_com_jce : 2.5.15
module_mod_jevents_cal : 3.4.8
module_mod_jevents_custom : 3.4.8
module_mod_jevents_filter : 3.4.8
module_mod_jevents_latest : 3.4.8
module_mod_jevents_legend : 3.4.8
module_mod_jevents_switchview : 3.4.8
plugin_content_jevents : 3.4.8
plugin_finder_jevents : 3.4.8 (not enabled)
plugin_search_eventsearch : 3.4.8
plugin_system_gwejson : 3.4.8
I am using German translations for JEvents version 3.4.1 as of 2016.03.10. The tag JEV_ADDTOYAHOO is used in:
.../components/com_jevents/views/default/helpers/defaulteventicaldialog.php
on line 37:
<a href="<?php echo JevExportHelper::getAddToYahooCal($row); ?>" title="<?php echo JText::_("JEV_ADDTOYAHOO"

?>" target="_blank" >
However I could not find it in any of the language files.
The tags for
JEV_SAVE_EVENT_AS_ICAL
JEV_SAVE_EVENT_IN_GCAL
JEV_SAVE_EVENT_IN_YAHOO
JEV_SAVE_EVENT_AND_ALL_RECURRENCES_AS_ICAL
are commented in (";"
.../language/de-DE/de-DE.com_jevents.ini
I suggest the following translations
JEV_SAVE_EVENT_AS_ICAL="iCal-Datei speichern"
JEV_SAVE_EVENT_IN_GCAL="An Google Kalender senden"
JEV_SAVE_EVENT_IN_YAHOO="An Yahoo Kalender senden"
JEV_SAVE_EVENT_AND_ALL_RECURRENCES_AS_ICAL="Event und alle Wiederholungen"
and an additional tag
JEV_ADDTOYAHOO="An Yahoo Kalender senden"
I do not know if it causes any side effects. My installation looks quite German now :-)
Regards
Rudi