espeak: provide string length with 0 character, fixes problems with qgc reading out strange values/chars at the end of the sentence
espeak: provide string length with 0 character, fixes problems with qgc reading out strange values/chars at the end of the sentence

TheIronBorn/qgroundcontrol,lis-epfl/qgroundcontrol,catch-twenty-two/qgroundcontrol,cfelipesouza/qgroundcontrol,greenoaktree/qgroundcontrol,kd0aij/qgroundcontrol,iidioter/qgroundcontrol,kd0aij/qgroundcontrol,CornerOfSkyline/qgroundcontrol,devbharat/qgroundcontrol,remspoor/qgroundcontrol,josephlewis42/UDenverQGC2,kd0aij/qgroundcontrol,scott-eddy/qgroundcontrol,lis-epfl/qgroundcontrol,mihadyuk/qgroundcontrol,nado1688/qgroundcontrol,mihadyuk/qgroundcontrol,caoxiongkun/qgroundcontrol,nado1688/qgroundcontrol,hejunbok/qgroundcontrol,cfelipesouza/qgroundcontrol,nado1688/qgroundcontrol,scott-eddy/qgroundcontrol,Hunter522/qgroundcontrol,dagoodma/qgroundcontrol,scott-eddy/qgroundcontrol,UAVenture/qgroundcontrol,greenoaktree/qgroundcontrol,dagoodma/qgroundcontrol,dagoodma/qgroundcontrol,scott-eddy/qgroundcontrol,scott-eddy/qgroundcontrol,LIKAIMO/qgroundcontrol,cfelipesouza/qgroundcontrol,kd0aij/qgroundcontrol,mihadyuk/qgroundcontrol,RedoXyde/PX4_qGCS,josephlewis42/UDenverQGC2,devbharat/qgroundcontrol,catch-twenty-two/qgroundcontrol,CornerOfSkyline/qgroundcontrol,RedoXyde/PX4_qGCS,iidioter/qgroundcontrol,Hunter522/qgroundcontrol,TheIronBorn/qgroundcontrol,ethz-asl/qgc_asl,josephlewis42/UDenverQGC2,nado1688/qgroundcontrol,CornerOfSkyline/qgroundcontrol,devbharat/qgroundcontrol,jy723/qgroundcontrol,Hunter522/qgroundcontrol,devbharat/qgroundcontrol,remspoor/qgroundcontrol,BMP-TECH/qgroundcontrol,lis-epfl/qgroundcontrol,BMP-TECH/qgroundcontrol,greenoaktree/qgroundcontrol,BMP-TECH/qgroundcontrol,Hunter522/qgroundcontrol,iidioter/qgroundcontrol,TheIronBorn/qgroundcontrol,josephlewis42/UDenverQGC2,mihadyuk/qgroundcontrol,jy723/qgroundcontrol,devbharat/qgroundcontrol,BMP-TECH/qgroundcontrol,UAVenture/qgroundcontrol,catch-twenty-two/qgroundcontrol,cfelipesouza/qgroundcontrol,fizzaly/qgroundcontrol,hejunbok/qgroundcontrol,fizzaly/qgroundcontrol,LIKAIMO/qgroundcontrol,lis-epfl/qgroundcontrol,iidioter/qgroundcontrol,LIKAIMO/qgroundcontrol,catch-twenty-two/qgroundcontrol,kd0aij/qgroundcontrol,catch-twenty-two/qgroundcontrol,LIKAIMO/qgroundcontrol,nado1688/qgroundcontrol,caoxiongkun/qgroundcontrol,greenoaktree/qgroundcontrol,fizzaly/qgroundcontrol,CornerOfSkyline/qgroundcontrol,jy723/qgroundcontrol,jy723/qgroundcontrol,dagoodma/qgroundcontrol,jy723/qgroundcontrol,UAVenture/qgroundcontrol,iidioter/qgroundcontrol,hejunbok/qgroundcontrol,mihadyuk/qgroundcontrol,ethz-asl/qgc_asl,hejunbok/qgroundcontrol,ethz-asl/qgc_asl,RedoXyde/PX4_qGCS,RedoXyde/PX4_qGCS,remspoor/qgroundcontrol,TheIronBorn/qgroundcontrol,kd0aij/qgroundcontrol,greenoaktree/qgroundcontrol,remspoor/qgroundcontrol,ethz-asl/qgc_asl,BMP-TECH/qgroundcontrol,remspoor/qgroundcontrol,caoxiongkun/qgroundcontrol,lis-epfl/qgroundcontrol,LIKAIMO/qgroundcontrol,caoxiongkun/qgroundcontrol,UAVenture/qgroundcontrol,cfelipesouza/qgroundcontrol,Hunter522/qgroundcontrol,BMP-TECH/qgroundcontrol,fizzaly/qgroundcontrol,RedoXyde/PX4_qGCS,devbharat/qgroundcontrol,TheIronBorn/qgroundcontrol,caoxiongkun/qgroundcontrol,greenoaktree/qgroundcontrol,nado1688/qgroundcontrol,remspoor/qgroundcontrol,dagoodma/qgroundcontrol,jy723/qgroundcontrol,mihadyuk/qgroundcontrol,fizzaly/qgroundcontrol,CornerOfSkyline/qgroundcontrol,CornerOfSkyline/qgroundcontrol,Hunter522/qgroundcontrol,TheIronBorn/qgroundcontrol,hejunbok/qgroundcontrol,scott-eddy/qgroundcontrol,LIKAIMO/qgroundcontrol,RedoXyde/PX4_qGCS,UAVenture/qgroundcontrol,iidioter/qgroundcontrol,hejunbok/qgroundcontrol,cfelipesouza/qgroundcontrol,catch-twenty-two/qgroundcontrol,UAVenture/qgroundcontrol,ethz-asl/qgc_asl,fizzaly/qgroundcontrol,dagoodma/qgroundcontrol,caoxiongkun/qgroundcontrol