Link to RMAs instead of "Returns"
Link to RMAs instead of "Returns"

On the edit order page, there's a link to the order's return authorizations.
This link is translated as "returns", which is confusing (the German translation
for example now has two links both saying "customer returns").

The key is only ever used in this instance, so when we change it to RMAs,
we can get rid of one translation key.

Fixes #6510

vinsol/spree,useiichi/spree,DynamoMTL/spree,locomotivapro/spree,zaeznet/spree,cutefrank/spree,beni55/spree,odk211/spree,sfcgeorge/spree,progsri/spree,brchristian/spree,omarsar/spree,softr8/spree,CiscoCloud/spree,softr8/spree,brchristian/spree,Kagetsuki/spree,imella/spree,karlitxo/spree,alvinjean/spree,lyzxsc/spree,ahmetabdi/spree,JuandGirald/spree,fahidnasir/spree,reidblomquist/spree,gautamsawhney/spree,progsri/spree,shaywood2/spree,vinayvinsol/spree,quentinuys/spree,reidblomquist/spree,thogg4/spree,rakibulislam/spree,vinayvinsol/spree,Kagetsuki/spree,welitonfreitas/spree,DarkoP/spree,miyazawatomoka/spree,shekibobo/spree,berkes/spree,imella/spree,NerdsvilleCEO/spree,Kagetsuki/spree,locomotivapro/spree,grzlus/spree,thogg4/spree,shaywood2/spree,NerdsvilleCEO/spree,NerdsvilleCEO/spree,alejandromangione/spree,berkes/spree,pervino/spree,omarsar/spree,beni55/spree,CiscoCloud/spree,pulkit21/spree,odk211/spree,priyank-gupta/spree,yiqing95/spree,yiqing95/spree,rajeevriitm/spree,vmatekole/spree,alvinjean/spree,shaywood2/spree,pulkit21/spree,progsri/spree,abhishekjain16/spree,vinayvinsol/spree,CiscoCloud/spree,vmatekole/spree,lsirivong/spree,cutefrank/spree,shekibobo/spree,grzlus/spree,moneyspyder/spree,gregoryrikson/spree-sample,imella/spree,abhishekjain16/spree,rajeevriitm/spree,piousbox/spree,DynamoMTL/spree,rakibulislam/spree,lsirivong/spree,firman/spree,shekibobo/spree,dafontaine/spree,ayb/spree,KMikhaylovCTG/spree,alvinjean/spree,hifly/spree,maybii/spree,quentinuys/spree,nooysters/spree,SadTreeFriends/spree,brchristian/spree,azranel/spree,hifly/spree,mindvolt/spree,mleglise/spree,njerrywerry/spree,joanblake/spree,zamiang/spree,alejandromangione/spree,quentinuys/spree,kewaunited/spree,lyzxsc/spree,CJMrozek/spree,SadTreeFriends/spree,useiichi/spree,useiichi/spree,jimblesm/spree,yiqing95/spree,TimurTarasenko/spree,tomash/spree,jimblesm/spree,maybii/spree,firman/spree,softr8/spree,orenf/spree,SadTreeFriends/spree,odk211/spree,vinayvinsol/spree,thogg4/spree,lsirivong/spree,pulkit21/spree,mindvolt/spree,firman/spree,jimblesm/spree,siddharth28/spree,gautamsawhney/spree,Hawaiideveloper/shoppingcart,gautamsawhney/spree,hifly/spree,orenf/spree,jasonfb/spree,CJMrozek/spree,beni55/spree,edgward/spree,TrialGuides/spree,vcavallo/spree,trigrass2/spree,trigrass2/spree,locomotivapro/spree,nooysters/spree,abhishekjain16/spree,sfcgeorge/spree,DynamoMTL/spree,alejandromangione/spree,cutefrank/spree,builtbybuffalo/spree,caiqinghua/spree,yushine/spree,miyazawatomoka/spree,pulkit21/spree,lsirivong/spree,nooysters/spree,DynamoMTL/spree,JDutil/spree,calvinl/spree,vcavallo/spree,dafontaine/spree,grzlus/spree,groundctrl/spree,ayb/spree,welitonfreitas/spree,JuandGirald/spree,tancnle/spree,groundctrl/spree,KMikhaylovCTG/spree,beni55/spree,robodisco/spree,jparr/spree,jaspreet21anand/spree,kewaunited/spree,ramkumar-kr/spree,firman/spree,moneyspyder/spree,vinsol/spree,mindvolt/spree,jasonfb/spree,ramkumar-kr/spree,piousbox/spree,robodisco/spree,priyank-gupta/spree,softr8/spree,jasonfb/spree,piousbox/spree,omarsar/spree,gautamsawhney/spree,orenf/spree,jeffboulet/spree,berkes/spree,sfcgeorge/spree,azranel/spree,DarkoP/spree,njerrywerry/spree,FadliKun/spree,TrialGuides/spree,patdec/spree,moneyspyder/spree,zamiang/spree,vmatekole/spree,FadliKun/spree,ayb/spree,maybii/spree,locomotivapro/spree,nooysters/spree,Hawaiideveloper/shoppingcart,thogg4/spree,priyank-gupta/spree,joanblake/spree,caiqinghua/spree,AgilTec/spree,tancnle/spree,maybii/spree,TrialGuides/spree,trigrass2/spree,priyank-gupta/spree,ahmetabdi/spree,pervino/spree,shekibobo/spree,Lostmyname/spree,yushine/spree,APohio/spree,karlitxo/spree,moneyspyder/spree,gregoryrikson/spree-sample,ahmetabdi/spree,builtbybuffalo/spree,groundctrl/spree,JDutil/spree,edgward/spree,vinsol/spree,tomash/spree,Lostmyname/spree,hoanghiep90/spree,zamiang/spree,Lostmyname/spree,jeffboulet/spree,azranel/spree,yushine/spree,Hawaiideveloper/shoppingcart,jasonfb/spree,jaspreet21anand/spree,jeffboulet/spree,TimurTarasenko/spree,calvinl/spree,AgilTec/spree,sliaquat/spree,zaeznet/spree,jaspreet21anand/spree,Kagetsuki/spree,yiqing95/spree,builtbybuffalo/spree,JuandGirald/spree,mleglise/spree,KMikhaylovCTG/spree,dafontaine/spree,joanblake/spree,rakibulislam/spree,wolfieorama/spree,mleglise/spree,siddharth28/spree,vinsol/spree,zaeznet/spree,tancnle/spree,DarkoP/spree,miyazawatomoka/spree,sliaquat/spree,zamiang/spree,jimblesm/spree,kewaunited/spree,siddharth28/spree,joanblake/spree,robodisco/spree,omarsar/spree,JuandGirald/spree,wolfieorama/spree,mindvolt/spree,volpejoaquin/spree,TrialGuides/spree,hoanghiep90/spree,trigrass2/spree,piousbox/spree,fahidnasir/spree,sliaquat/spree,shaywood2/spree,CJMrozek/spree,sfcgeorge/spree,volpejoaquin/spree,volpejoaquin/spree,dafontaine/spree,progsri/spree,kewaunited/spree,rajeevriitm/spree,volpejoaquin/spree,groundctrl/spree,yushine/spree,AgilTec/spree,TimurTarasenko/spree,raow/spree,abhishekjain16/spree,lyzxsc/spree,patdec/spree,reidblomquist/spree,njerrywerry/spree,brchristian/spree,fahidnasir/spree,raow/spree,TimurTarasenko/spree,hoanghiep90/spree,caiqinghua/spree,hoanghiep90/spree,azranel/spree,vmatekole/spree,patdec/spree,KMikhaylovCTG/spree,ramkumar-kr/spree,APohio/spree,reidblomquist/spree,lyzxsc/spree,ayb/spree,SadTreeFriends/spree,Lostmyname/spree,odk211/spree,useiichi/spree,wolfieorama/spree,CJMrozek/spree,raow/spree,jeffboulet/spree,pervino/spree,sliaquat/spree,CiscoCloud/spree,miyazawatomoka/spree,raow/spree,DarkoP/spree,JDutil/spree,zaeznet/spree,calvinl/spree,siddharth28/spree,NerdsvilleCEO/spree,pervino/spree,ahmetabdi/spree,patdec/spree,tancnle/spree,orenf/spree,vcavallo/spree,gregoryrikson/spree-sample,fahidnasir/spree,edgward/spree,builtbybuffalo/spree,jaspreet21anand/spree,rakibulislam/spree,welitonfreitas/spree,ramkumar-kr/spree,robodisco/spree,tomash/spree,hifly/spree,rajeevriitm/spree,quentinuys/spree,tomash/spree,jparr/spree,berkes/spree,karlitxo/spree,edgward/spree,APohio/spree,alejandromangione/spree,grzlus/spree,welitonfreitas/spree,jparr/spree,APohio/spree,alvinjean/spree,jparr/spree,FadliKun/spree,cutefrank/spree,Hawaiideveloper/shoppingcart,calvinl/spree,wolfieorama/spree,karlitxo/spree,AgilTec/spree,mleglise/spree,vcavallo/spree,njerrywerry/spree,gregoryrikson/spree-sample,JDutil/spree,FadliKun/spree,caiqinghua/spree