As you can see on this thread, Kor mentioned editing unused strings instead of adding new ones. In an attempt to discover which strings were available for edition, I've realized every single unit that appears on the editor with its internal name instead of the external name has a free string slot assigned to it. Since the game is unable to locate a text string in that slot, it displays the internal name.

Several units actually use the same string (5000 is by far the most used). I recommend that, if you are to change a string slot, keep one free and, if possible, change the external name of the units below to that free slot. This way you won't have problems if you make a replacement, else units other than the one you wanted to give a new name will be given that string, which can cause some confusion.

Here we go:

ABGAL 5703
ACOAR_D 5000
AHXBW_D 5026
ARCHR_D 5007
BCANN_D 5009
BDGAL 5285
BHUSKX_D 5432
BHUSK_D 5682
BOARJ_D 5680
BOARX_D 5723
BOLTF 5017
BOLTF1 5312
BOLTX 5313
BOLTXF 5312
BRSRK_D 5010
BTRAM_D 5011
CANGA_D 1751
CARCH_D 5012
CATAP_D 5013
CATSF 5314
CATST 5315
CATST1 5315
CATST2 5315
CATST3 5315
CATST4 5315
CATST5 5315
CVATR_D 5290
CHUKN_D 5014
CLF01 5249
CLF02 5249
CLF03 5249
CLF04 5249
CLF05 5249
CLF06 5249
CLF07 5249
CLF08 5249
CLF09 5249
CLF10 5249
COBRA 5658
COBRA_D 5659
COGXX_D 5015
CONQI_D 5688
CVLRY_D 5031
CVRCH_D 5016
DEBRI 5282
DEERX_D 5017
DERVI_D 5018
DOLP3 5332
DOLO4 5333
DOLP5 5334
DOPL 5248
DUSTC 5283
EAGLE_D 5672
FISH5 5339
FLAGX 5250
FLARE4 5579
FLDOG 5441
FLR_R 5651
FSHSP_D 5020
GALLY_D 5021
GBRSK_D 5022
GENITX_D 5666
GENIT_D 5664
GJAGR_D 5713
HALEN_D 5000
HALFON_D 5741
HAOE_D 5569
HATTILA_D 5696
HBERT_D 5000
HBLEDA_D 5698
HBURE_D 5548
HCANR_D 5024
HCLRY_D 5031
HCMAR_D 5292
HCVAR_D 5528
HELCIDC_D 5725
HENRY_D 5748
HEROBOAR_D 5711
HEROC_D 5472
HEROF_D 5530
HEROI_D 5470
HFALS_D 5000
HGRAV_D 5540
HHAHA_D 5000
HHIRE_D 5000
HHRTG_D 5296
HIMAM_D 5743
HJOA_D 5298
HJOKT_D 5527
HJOSS_D 5000
HKHAN_D 5614
HKUSH_D 5000
HLBDM_D 5040
HLORR_D 5542
HMETZ_D 5000
HMOT_D 5000
HNOB_D 5746
HORNL_D 5590
HORSE_D 5715
HORSW_D 5736
HPIKL_D 5616
HPOPE_D 5700
HREY_D 5000
HRICH_D 5000
HSANC_D 5739
HSHAH_D 5587
HSUBO_D 5000
HTHSW_D 5047
HUSSAR_D 5662
HVSWD_D 5025
HWBAL_D 5440
HWIL_D 5750
HWITCH_D 5702
HWIWA_D 5300
HWOLF_D 5000
HXBOW_D 5026
ICE 5610
INFIL_D 5027
ISPKM_D 5040
JAGUAR_D 5668
JANNI_D 5028
JUNKX_D 5029
KINGX_D 5302
KNGHT_D 5030
LANCE_D 5031
LNGBR_D 5032
LNGBW_D 5033
LTCAV_D 5445
MANGO_D 5034
MANGST 5315
MFCST 5650
MFFFG 5558
MFGAL 5312
MFHSB 5525
MFMAN 5315
MFMNB 5556
MFMSU 5315
MFONG 5450
MFSBL 5312
MFSGY 5438
MFSTW 5706
MFTRB 5315
MFWGL 5312
MNG_FLM 5315
MONKX_D 5035
MONKY_D 5692
MOSUN_D 5036
MPCAV_D 5037
MRBCN 5315
MRBTW 5315
MRCGL 5315
MRCGX 5315
MRCST 5649
MRFRG 5434
MRGP1 5555
MRHCN 5315
MRHFG 5435
MRFSB 5524
MRMAN 5315
MRMLK 5617
MRMNB 5554
MRMSU 5315
MRONG 5549
MRSBL 5313
MRSGY 5437
MRSTW 5705
MRTRB 5315
OLD-ACADEMY 5000
OLD-EXPLORER 5000
OLD-FISH1 5000
OLD-FISH2 5000
OLD-FISH3 5000
OLD-FISH4 5000
OLD-FISHERMAN 5000
OLD-GATOR 5000
OLD-GOLDMINER 5000
OMTBO 5303
OMTBO_D 5304
ONAGR_D 5557
OREMN 5251
OUTLW 5074
OUTLW_D 5038
PALDN_D 5039
PILE1 5286
PILE2 5286
PILE3 5286
PILE4 5286
PILE6 5286
PILE8 5286
PKEMN_D 5040
PLUME_D 5684
PMANG 5410
POREX 5322
PTREB_D 5000
PTWC 5311
RCARC 5480
RCARC_D 5481
RCSWD 5478
RCSWD_D 5479
RFARC 5474
RFARC_D 5475
RFSWD 5476
RFSWD_D 5477
SCBAL_D 5041
SCOUT_D 5327
SGRAM_D 5447
SHALW 5325
SHEEP_D 5000
SMOKE 5317
SMURI_D 5042
SNAGR_D 5494
SPRMN_D 5043
STRBO 5305
STRBO_D 5306
SWDMN_D 5044
S_FIRE 5559
S_SMOKE 5551
TARKAN_D 5676
TAXEM_D 5045
TCARTF_D 5655
TCART_D 5046
TERRB 5254
TERRC 5255
TERRD 5256
TERRE 5257
TERRF 5258
TERRH 5260
TERRI 5261
TERRK 5263
TERRL 5264
TERRU 5390
TERRV 5391
TERRW 5392
TERRY 5394
TERRZ 5395
THSWD_D 5047
TKNIT_D 5048
TMISA 5524
TMISB 5225
TMISC 5226
TMISD 5227
TMISE 5228
TMISF 5229
TMISG 5230
TMISH 5231
TMISI 5232
TMISJ 5233
TMISK 5234
TMISL 5235
TREBST 5315
TREBU_D 5049
TROCK 5284
TURKY_D 5734
TWAL 5201
UCONQ_D 5690
UPLUM_D 5686
UVBRK_D 5577
UWAGO_D 5730
VBRK_D 5575
VFBAS_D 5057
VFBLD_D 5058
VFFAR_D 5059
VFFIS_D 5000
VFFOR_D 5403
VFGLD_D 5483
VFHUN_D 5060
VFLUM_D 5061
VFMIN_D 5062
VFREP_D 5063
VFSHE_D 5000
VMBAS_D 5057
VMBLD_D 5058
VMDL 5656
VMDL_D 5657
VMFAR_D 5059
VMFIS_D 5000
VMFOR_D 5403
VMGLD_D 5483
VMHUN_D 5060
VMLUM_D 5061
VMMIN_D 5062
VMREP_D 5063
VMSHE_D 5064
WAGON_D 5728
WARGA_D 5310
WBRSK_D 5064
WHAL1 5340
WHAL2 5341
WOLF2_D 5653
WOLFX_D 5065
XBOWM_D 5066
mkyby_D 5000

Also, for the creation command string, just add 1000 to the external name string. For example, if you use the string 5000, the creation string would be 6000. All creation strings of these units are empty as well.

quite a big topic post, huh?

EDIT: as soon as possible, I'm gonna merge every single list useful to data editors into one file.

[This message has been edited by Cesar Bernardi (edited 11-12-2007 @ 01:45 PM).]