Add lexica

Introduce OLang/MDF for use with
+Err/Lex+OLang/RUS when there are inflected

src/fst/root.lexc

@@ -601,6 +601,41 @@ Multichar_Symbols !!≈!!@CODE@ / Analysis symbols
 +Der/PatrMal 
 +Der/PatrFem
 
+!! # Tags for originating language
+
+!! The following tags are used to guide conversion to IPA: loan words
+!! and foreign names are usually pronounced (approximately) as in the
+!! originating (majority) language. Instead of trying to identify the
+!! correct pronunciation based on phonotactics (orthotactics actually),
+!! we tag all words that can't be correctly transcribed using the SME
+!! transcriber with source language codes. Once tagged, it is possible
+!! to split the lexical transducer in smaller ones according to langu-
+!! age, and apply different IPA conversion to each of them.
+!!
+!! The principle of tagging is that we only tag to the extent needed,
+!! and following a priority:
+!! 1. any untagged word is pronounced with SME orthographic conventions
+!! 1. NNO and NOB have identical pronunciation, NNO is only used if
+!!   different in spelling from NOB
+!! 1. SWE has mostly the same pronunciation as NOB, and is only used
+!!   if different in spelling from NOB
+!! 1. Occasionally even SME (the default) may be tagged, to block other
+!!   languages from being specified, mainly during semi-automatic
+!!   language tagging sessions
+!!
+!! All in all, we want to get as much correctly transcribed to IPA
+!! with as little work as possible. On the other hand, if more words
+!! are tagged than strictly needed, this should pose no problem as
+!! long as the IPA conversion is correct - at least some words will
+!! get the same pronunciation whether read as SME or NOB/NNO/SWE.
+
++OLang/CHV !!≈ * **@CODE@** = Chuvash
++OLang/MDF !!≈ * **@CODE@** = Moksha
++OLang/MYV !!≈ * **@CODE@** = Erzya
++OLang/RUS !!≈ * **@CODE@** = Russian
++OLang/TAT !!≈ * **@CODE@** = Tatar
+
+
 !! Morphophonology
 !  ---------------
 !! To represent phonologic variations in word forms we use the following