Pl follow the steps in MOS 1080973.1 - for NLS, see step 3 in the post-update steps section of the doc.
Download the NLS patches of (Oracle E-Business Suite Release 12.1.3 Patch 9239090), merge the patches in a single patch driver and apply the NLS patches for the two languages you have.
You may also refer to:
Oracle Applications NLS Release Notes, Release 12.1 (Doc ID 788053.1) -- Maintaining existing translations in a Release 12.1.1 system
Requesting Translation Synchronization Patches (Doc ID 252422.1)