file uploader encoding error fix and label update

Domain2GO.py

@@ -35,9 +35,23 @@ with st.sidebar:
             st.session_state['sequence'] = st.text_area('Enter a protein sequence in FASTA format*')
         st.session_state['name'] = st.session_state['sequence'].split('\n')[0].strip('>')
     else:
-        protein_input = st.file_uploader('Choose file')
+        protein_input = st.file_uploader('Choose a file', type=['.fasta', '.fas', '.fa', '.fna', '.ffn', '.faa', '.mpfa', '.frn', '.txt'])
+        css='''
+        <style>
+        [data-testid="stFileUploadDropzone"] div div::after {color:gray; font-size: .8em; content:"FASTA file should contain only one sequence."}
+        [data-testid="stFileUploadDropzone"] div div small{display:none;}
+        </style>
+        '''
+
+        st.markdown(css, unsafe_allow_html=True)
+        
         if protein_input:
-            protein_input_stringio = StringIO(protein_input.getvalue().decode("utf-8"))
+            bytes_data = protein_input.read()
+            try:
+                protein_input_stringio = StringIO(bytes_data.decode("utf-8"))
+            except UnicodeDecodeError:
+                protein_input_stringio = StringIO(bytes_data.decode("utf-16"))
+                
             fasta_sequences = SeqIO.parse(protein_input_stringio, 'fasta')
             for fasta in fasta_sequences:
                 st.session_state['name'], st.session_state['sequence'] = fasta.id, str(fasta.seq)