The changes must be made in both files. Both in the Joomla language and in the template language
TPL_GROUP_EXTRA_FIELDS_LABEL ="Extra Fields"
TPL_LONG_DESCRIPTION_LABEL ="Project Description"
TPL_LONG_DESCRIPTION_DESC ="Update description for the portfolio, supports HTML"
TPL_PROJECT_TYPE_LABEL ="Project Type"
TPL_PROJECT_TYPE_DESC ="Add project type, for example: Website Design"
TPL_CLIENT_LABEL ="Client Name"
TPL_CLIENT_DESC ="Add Client Name"
TPL_DAY_LABEL ="Project Duration (Days)"
TPL_DAY_DESC ="Add the Project Duration (in Days)"
TPL_LINK_PROJECT_LABEL ="Project Link"
TPL_LINK_PROJECT_DESC ="Add project link"
TPL_RATING_LABEL ="Project Rate"
TPL_RATING_DESC ="Add project rate"
/language/en-GB/en-GB.tpl_ja_alpha.ini
/language/en-GB/en-GB.tpl_ja_alpha.sys.ini
/template/ja-alpha/language/en-GB/en-GB.tpl_ja_alpha.ini
/template/ja-alpha/language/en-GB/en-GB.tpl_ja_alpha.sys.ini