case insensitive ipa code conversion

app/codes.py

@@ -174,6 +174,7 @@ def ipa2arpabet(ipa_string, lang="eng"):
 
 def arpabet2ipa(arpabet_string, lang="eng"):
     update_dict_with_tones(ARPABET2IPA, IPA2ARPABET, lang)
+    arpabet_string = arpabet_string.upper()
     if " " in arpabet_string:
         arpabet_symbols = arpabet_string.split()
     else:
@@ -197,6 +198,7 @@ def ipa2epadb(ipa_string, lang="eng"):
 
 def epadb2ipa(epadb_string, lang="eng"):
     update_dict_with_tones(EPADB2IPA, IPA2EPADB, lang)
+    epadb_string = epadb_string.upper()
     if " " in epadb_string:
         epadb_symbols = epadb_string.split()
     else:
@@ -270,6 +272,7 @@ def ipa2timit(ipa_string, lang="eng"):
 
 def timit2ipa(timit_string, lang="eng"):
     update_dict_with_tones(TIMIT2IPA, IPA2TIMIT, lang)
+    timit_string = timit_string.upper()
     if " " in timit_string:
         timit_symbols = timit_string.split()
     else:
@@ -352,6 +355,7 @@ def ipa2isle(ipa_string, lang="eng"):
 
 def isle2ipa(isle_string, lang="eng"):
     update_dict_with_tones(ISLE2IPA, IPA2ISLE, lang)
+    isle_string = isle_string.upper()
     if " " in isle_string:
         isle_symbols = isle_string.split()
     else: