misc: Improve error message
misc: Improve error message

Running “./run_tests” after installing coala for the first time,
prompts the user to install “msgfmt” , assuming that he already has
“gettext”. Thus, overriding the assumption, both these packages need to
be mentioned.

Fixes: https://github.com/coala-analyzer/coala/issues/368

tltuan/coala,JohnS-01/coala,arjunsinghy96/coala,Tanmay28/coala,saurabhiiit/coala,refeed/coala,coala/coala,arush0311/coala,SambitAcharya/coala,coala/coala,ManjiriBirajdar/coala,Nosferatul/coala,kartikeys98/coala,swatilodha/coala,jayvdb/coala,coala-analyzer/coala,sophiavanvalkenburg/coala,kartikeys98/coala,RJ722/coala,sophiavanvalkenburg/coala,andreimacavei/coala,mr-karan/coala,NiklasMM/coala,CruiseDevice/coala,jayvdb/coala,nemaniarjun/coala,sophiavanvalkenburg/coala,SambitAcharya/coala,nemaniarjun/coala,yashtrivedi96/coala,abhiroyg/coala,NiklasMM/coala,scriptnull/coala,rimacone/testing2,stevemontana1980/coala,MariosPanag/coala,aptrishu/coala,SanketDG/coala,dagdaggo/coala,sagark123/coala,Shade5/coala,netman92/coala,yland/coala,abhiroyg/coala,meetmangukiya/coala,lonewolf07/coala,d6e/coala,netman92/coala,yashLadha/coala,Tanmay28/coala,nemaniarjun/coala,Tanmay28/coala,shreyans800755/coala,impmihai/coala,MariosPanag/coala,JohnS-01/coala,MariosPanag/coala,stevemontana1980/coala,yashtrivedi96/coala,rresol/coala,scottbelden/coala,NalinG/coala,SambitAcharya/coala,yland/coala,impmihai/coala,damngamerz/coala,mr-karan/coala,Tanmay28/coala,SambitAcharya/coala,jayvdb/coala,sils1297/coala,scriptnull/coala,karansingh1559/coala,sils1297/coala,aptrishu/coala,refeed/coala,CruiseDevice/coala,Asnelchristian/coala,d6e/coala,scriptnull/coala,svsn2117/coala,AdeshAtole/coala,meetmangukiya/coala,svsn2117/coala,AdeshAtole/coala,sils1297/coala,scriptnull/coala,tushar-rishav/coala,Uran198/coala,scottbelden/coala,MattAllmendinger/coala,tltuan/coala,vinc456/coala,NalinG/coala,abhiroyg/coala,arafsheikh/coala,lonewolf07/coala,SambitAcharya/coala,NalinG/coala,damngamerz/coala,karansingh1559/coala,NalinG/coala,NiklasMM/coala,SanketDG/coala,scriptnull/coala,RJ722/coala,Nosferatul/coala,Uran198/coala,SambitAcharya/coala,yashtrivedi96/coala,AdeshAtole/coala,tltuan/coala,shreyans800755/coala,mr-karan/coala,scriptnull/coala,sudheesh001/coala,netman92/coala,swatilodha/coala,Balaji2198/coala,ayushin78/coala,kartikeys98/coala,Asalle/coala,ayushin78/coala,MattAllmendinger/coala,damngamerz/coala,arjunsinghy96/coala,Uran198/coala,rresol/coala,saurabhiiit/coala,coala/coala,Balaji2198/coala,Tanmay28/coala,djkonro/coala,scriptnull/coala,RJ722/coala,dagdaggo/coala,NalinG/coala,refeed/coala,Tanmay28/coala,rresol/coala,SanketDG/coala,Shade5/coala,andreimacavei/coala,coala-analyzer/coala,incorrectusername/coala,dagdaggo/coala,djkonro/coala,Asnelchristian/coala,swatilodha/coala,shreyans800755/coala,scottbelden/coala,yland/coala,FeodorFitsner/coala,stevemontana1980/coala,rimacone/testing2,MattAllmendinger/coala,karansingh1559/coala,saurabhiiit/coala,lonewolf07/coala,Shade5/coala,vinc456/coala,AbdealiJK/coala,incorrectusername/coala,d6e/coala,Balaji2198/coala,Tanmay28/coala,ayushin78/coala,tushar-rishav/coala,aptrishu/coala,Nosferatul/coala,rimacone/testing2,tushar-rishav/coala,Asalle/coala,djkonro/coala,yashLadha/coala,impmihai/coala,JohnS-01/coala,Tanmay28/coala,vinc456/coala,sagark123/coala,meetmangukiya/coala,ManjiriBirajdar/coala,incorrectusername/coala,SambitAcharya/coala,Asnelchristian/coala,coala-analyzer/coala,AbdealiJK/coala,arush0311/coala,sudheesh001/coala,arjunsinghy96/coala,NalinG/coala,andreimacavei/coala,arush0311/coala,arafsheikh/coala,Asalle/coala,FeodorFitsner/coala,sudheesh001/coala,svsn2117/coala,sagark123/coala,NalinG/coala,yashLadha/coala,ManjiriBirajdar/coala,FeodorFitsner/coala,CruiseDevice/coala,arafsheikh/coala,AbdealiJK/coala