In general Language specialities should be accents.  The only people
without accents as specialities are:

* Excellent speakers of the language who have worked to remove their accent.
* Very poor speakers of the language who mostly know stuff in a
  topical area (viz a normal specialization).
* People who've learned a language entirely academically without using
  it on natives.  (They might have an entirely inappropriate accent
  specialization; but in general they'll be assumed to have an accent
  related to their native tongue).
  
Various different dialects are inter-understandable.  The table below
gives modifiers for understanding:

|                       |Breton|Cornish|English|French|||Occitan|Low German||Welsh|
|                       |      |       |       |AN|No|Ot|       |Fr|Other   |     |
|----------------------:|:----:|:-----:|:-----:|::|::|::|:-----:|::|:------:|:---:|
| Breton                |   0  |   -1  |       |  |  |  |       |  |        | -2  |
| Cornish               |  -1  |    0  |       |  |  |  |       |  |        |     |
| English               |      |       |   0   |  |  |  |       |-2|   -3   |     |
| French (Anglo-Norman) |      |       |       | 0|-1|-1|  -2   |  |        |     |
| French (Norman)       |      |       |       |-1| 0|-1|  -2   |  |        |     |
| French (Other)        |      |       |       |-1|-1| 0|  -2   |  |        |     |
| Occitan               |      |       |       |-2|-2|-2|   0   |  |        |     |
| Low German (Frisian)  |      |       |  -2   |  |  |  |       | 0|   -1   |     |
| Low German (Other)    |      |       |  -3   |  |  |  |       |-1|    0   |     |
| Welsh                 |  -2  |       |       |  |  |  |       |  |        |  0  |
[Language Penalties]