Fix vendor package translations handling

[saarma]

Problem

Currently while importing published vendor package the translations will not include the file names. So in the ltm_translations table the group column shows 'vendor/myPackage'.

Also when trying to export the translations, it'll try to export them in wrong folder.

For example:

1. Importing file from lang/vendor/myPackage/en/file.php
2. Group column in ltm_translations will be vendor/myPackage
3. Exporting will try to update translation in path lang/vendor/myPackage/en/en/vendor/myPackage.php

Solution

This fix will include file name to group column and when exporting translations it will export them to the right paths. e.g.

1. Importing file from lang/vendor/myPackage/en/file.php
2. Group column in ltm_translations will be vendor/myPackage/file
3. Exporting will try to update translation in path lang/vendor/myPackage/en/file.php

[vytsci]

Same issue here. Path is being built incorrectly.