Translation

The Procedure

For translation you need to use the file with workpiece phrases of Membership plugin – membership-by-supsystic/app/lang/default.poYou can edit it using Poedit, a cross-platform gettext catalogs (.po files) editor.
Duplicate the default.po file and rename it to lang_COUNTRY.po
- Example for the referenced plugin case: pt_BR.po
  — pt_BR means Portuguese Brazil, but many languages don’t have a country variation…
  — you’ll have to fill in with your own language
- WPLANG in wp-config.php file must be set to your language, e.g., pt_BR
- Every time you save in WordPress the .po file, PoEdit automatically generates a .mo file, which is the one WordPress uses and basically the only one you need to upload
Make the translation.
Create a directory supsystic-membership-lang in directory of your theme.
Add the translations (.po and .mo) files to this folder.
Or you can place your files by this path – /wp-content/languages/plugins/. But in this case files should be name like this – membership-by-supsystic-pt_BR.po

.mo stands for Machine Object
— compiled export of the .po file which is used by WordPress
.po stands for Portable Object
— editable text file with the translations strings
— based on the master .pot file, using Update from POT file PoEdit function
— some folks distribute this as a master file, but it should be used only for translations
.pot stands for Portable Object Template
— editable text file used to grab all the translatable strings from WordPress itself and Themes and Plugins, using Update from Sources PoEdit function

If you do a full or a decent partial translation of WordPress Membership plugin, submit it to the plugin author, so he can include it in the Repository and you get credited for it
Don’t forget to make a backup of your translation, because if you upgrade the Membership plugin, your file will be lost