[InstallDelete]
. . .
;---------------------------------------------------
; Localization files
;---------------------------------------------------
Name: {app}\AHI.App.Localization.dll; Type: files
Name: {app}\es\AHI.App.Localization.resources.dll; Type: files
. . .

[Files]
. . .
;---------------------------------------------------
; Localization files
;---------------------------------------------------
Source: {#SrcAppDir}\AHI.App.Localization.resources.dll; DestDir: {app}; Flags: ignoreversion skipifsourcedoesntexist
Source: {#SrcAppDir}\es\AHI.App.Localization.resources.dll; DestDir: {app}\es; Flags: ignoreversion skipifsourcedoesntexist
. . .