Trim ICU data to reduce the download size/memory usage

icu52/source/data/curr/en_GB.txt

Index: icu52/source/data/curr/en_GB.txt
===================================================================
--- icu52/source/data/curr/en_GB.txt	(revision 259715)
+++ icu52/source/data/curr/en_GB.txt	(working copy)
@@ -17,10 +17,6 @@
             "R$",
             "Brazilian Real",
         }
-        BYB{
-            "BYB",
-            "Belarusian New Rouble (1994–1999)",
-        }
         BYR{
             "BYR",
             "Belarusian Rouble",
@@ -45,10 +41,6 @@
             "HK$",
             "Hong Kong Dollar",
         }
-        ILR{
-            "ILR",
-            "Israeli Shekel (1980–1985)",
-        }
         ILS{
             "₪",
             "Israeli New Shekel",
@@ -85,10 +77,6 @@
             "RUB",
             "Russian Rouble",
         }
-        RUR{
-            "RUR",
-            "Russian Rouble (1991–1998)",
-        }
         SCR{
             "SCR",
             "Seychelles Rupee",
@@ -139,10 +127,6 @@
         }
     }
     CurrencyPlurals{
-        BYB{
-            one{"Belarusian new rouble (1994–1999)"}
-            other{"Belarusian new roubles (1994–1999)"}
-        }
         BYR{
             one{"Belarusian rouble"}
             other{"Belarusian roubles"}
@@ -151,10 +135,6 @@
             one{"British pound"}
             other{"British pounds"}
         }
-        ILR{
-            one{"Israeli shekel (1980–1985)"}
-            other{"Israeli shekels (1980–1985)"}
-        }
         ILS{
             one{"Israeli new shekel"}
             other{"Israeli new shekels"}
@@ -175,10 +155,6 @@
             one{"Russian rouble"}
             other{"Russian roubles"}
         }
-        RUR{
-            one{"Russian rouble (1991–1998)"}
-            other{"Russian roubles (1991–1998)"}
-        }
         SCR{
             one{"Seychelles rupee"}
             other{"Seychelles rupees"}