Upgrading and minor fixes

This release would solve some upgrading issues and minor fixes.

• [FIX] Solves #428. Forced password change didn't redirect to the password change page. Thanks to @k-s-dean for the feedback.
• [FIX] Solves #435. Wrong returning code when updating a record and data is the same stored. Thanks to @wernerreuser for the feedback.
• [MOD] Added paginated results for LDAP searching. Solves #439. Thanks to @zulink for the feedback
• [MOD] Removed index removal from DB upgrade.
• [FIX] Related #441. Fixed issue when performing an upgrade to 2.0 version, because some item constraints becomes invalid. It will require alternative IDs for those items that doesn't exist.
• [FIX] Fixed language issue when an error is thrown when performing config checks. Solves #434
• [FIX] Solves #428. Forced user's password change should not rely on sending email.
• [FIX] Fixed wrong measure for upload size. Thanks to @vilure
• [MOD] Log&email translated message when displaying auth token
• [MOD] Show translated messages when some errors are thrown
• [FIX] Constant BASE_DIR already defined
• [FIX] Fixed issue when filtering by customer/category. The select component didn't show the filtered item when returning from another view.
• [MOD] Updated German translation. Thanks to @lukasp2. Solves #418
• [ADD] Added Polish translation for Authenticator plugin. Thanks to @wojtek