Template based on Helix Ultimate, like any other template, includes .ini file which contains all of the English terms that we used: language\en-GB\en-GB.tpl_ensure.ini

Step 1:
Install Joomla translation for your native language, make it active.

Step 2:
Change the filename keeping original template name, for example:
from: en-GB.tpl_ensure.ini
to: xx-XX.tpl_ensure.ini

Where xx-XX is a LANG-PREFIX, for example, es-ES – for Spanish (Español), nl-NL – for Dutch, ru-RU - Russian, de-DE - German, etc.

Step 3:
In most cases, you should translate selected strings (used on front-end) to your language and save them with native language prefix. Each translated string must always be enclosed by double-quotes. File (.ini) must be saved as UTF-8 without BOM encoding. Inside you can find phrases for new addons. Example Helix phrases:

HELIX_ALREADY_RATED="You are already rated."
HELIX_ULTIMATE_MONTH="Month"
HELIX_ULTIMATE_MONTHS="Months"
HELIX_ULTIMATE_DAY="Day"
HELIX_ULTIMATE_DAYS="Days"
HELIX_ULTIMATE_HOUR="Hour"
HELIX_ULTIMATE_HOURS="Hours"
HELIX_ULTIMATE_MINUTE="Minute"
HELIX_ULTIMATE_MINUTES="Minutes"
HELIX_ULTIMATE_SECOND="Second"
HELIX_ULTIMATE_SECONDS="Seconds"
HELIX_ULTIMATE_TAGS="Tags :"
HELIX_ULTIMATE_SHARE="Share"